CN111199671A - Display apparatus system for biological teaching - Google Patents
Display apparatus system for biological teaching Download PDFInfo
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- CN111199671A CN111199671A CN202010185849.6A CN202010185849A CN111199671A CN 111199671 A CN111199671 A CN 111199671A CN 202010185849 A CN202010185849 A CN 202010185849A CN 111199671 A CN111199671 A CN 111199671A
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- box
- fixedly connected
- transparent display
- biological teaching
- rectangular column
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B19/00—Teaching not covered by other main groups of this subclass
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Abstract
The invention belongs to the technical field of teaching display, in particular to a display instrument system for biological teaching, which aims at the problems that the prior biological teaching display instrument has a single structure, and the common demonstration is that biological specimens are simply placed on a table for teaching, so that some small biological specimens can not be well displayed, and the comparison between the living things and the specimens can not be effectively carried out, and the direct introduction can not be carried out, the invention provides the following scheme, which comprises a base, wherein a rectangular column is movably connected on the base, a supporting box is fixedly connected at the top of the rectangular column, a transparent display box is movably connected at the top of the supporting box, the transparent display box is in a cylindrical structure, and a plurality of partition plates are fixedly connected inside the transparent display box, the invention has the advantages of convenient operation, convenient movement and fixation, convenient display of the biological specimens or living organisms, and effective comparison between the living things and the specimens, can carry out intuitive introduction and improve the learning interest.
Description
Technical Field
The invention relates to the technical field of teaching display, in particular to a display apparatus system for biological teaching.
Background
The biology subject is a science for studying nature and ecology, in biological teaching, knowledge related to the biology subject needs to be known, and introduction and demonstration of biological books are generally needed to deepen the learning impression.
The teaching display device for the existing biology has a single structure, and a common demonstration is that the biological specimens are simply placed on a desktop for teaching, so that some small biological specimens cannot be well displayed, living objects and specimens cannot be effectively compared, and visual introduction cannot be carried out.
Disclosure of Invention
The invention aims to solve the defects that the existing biological teaching display device has a single structure, and the common demonstration is to simply put biological specimens on a table for teaching, so that some small biological specimens cannot be well displayed, living objects and specimens cannot be effectively compared, and visual introduction cannot be carried out.
In order to achieve the purpose, the invention adopts the following technical scheme:
a display device system for biological teaching comprises a base, wherein a rectangular column is movably connected onto the base, a supporting box is fixedly connected onto the top of the rectangular column, a transparent display box is movably connected onto the top of the supporting box, the transparent display box is of a cylindrical structure, a plurality of partition plates are fixedly connected into the transparent display box, a supporting column is rotatably mounted on the top of the transparent display box, a polygonal box is fixedly connected onto the top of the polygonal box, a turnover cover is rotatably mounted on the top of the polygonal box, a plurality of magnetic blocks are adsorbed on the outer side of the polygonal box, a connecting box is fixedly connected onto the top of the base, the rectangular column is slidably connected with the connecting box, a rotating shaft is transversely rotatably mounted in the connecting box, a driving gear is fixedly sleeved on the outer side of the rotating shaft, a through hole is formed in the rectangular column, a rack is fixedly connected onto the inner, the bottom of base is seted up the end mouth groove, and sliding mounting has fly leaf and lifter plate in the end mouth groove, four gyro wheels of the bottom fixedly connected with of lifter plate, rotates on the top inner wall in end mouth groove and installs four threaded rods, and fly leaf and lifter plate all with threaded rod threaded connection, the rectangle post extend to the end mouth inslot and with the movable plate looks adaptation.
Preferably, support vertical swing joint has the cylinder on the box, and square groove has been seted up to cylindrical bottom, and slidable mounting has square pole in the square groove, and the bottom of square pole rotates with the bottom inner wall that supports the box to be connected, and fixed mounting has same spring between square pole and the square groove, and the spring provides ascending elasticity for the cylinder through the support of square pole.
Preferably, the fixed cover in cylindrical outside is equipped with the annular piece, and a plurality of button head poles of the top fixedly connected with of annular piece evenly have seted up a plurality of slots on the top inner wall of support box, button head pole and the round slot looks adaptation that corresponds, and the button head pole gets into and can increase cylindrical stability in the round slot.
Preferably, one end of the rotating shaft is fixedly connected with a hand gear, and a crank is rotatably arranged at the eccentric position of the hand gear.
Preferably, the connecting box is provided with a polygonal rod in a transverse sliding mode, a fixed gear is fixedly sleeved on the outer side of the polygonal rod and matched with the hand gear, the rotating shaft can be fixed when the fixed gear is in contact with the outer side of the hand gear, and the fixed gear can be released from being fixed when the fixed gear is separated from the hand gear.
Preferably, the top of fly leaf fixedly connected with one end of a plurality of extension springs, the top inner wall fixed connection that the other end of a plurality of extension springs all had the end mouth groove, and the extension spring provides ascending pulling force for the fly leaf.
Preferably, four guide rods are fixedly mounted on the inner wall of the top of the bottom opening groove, the movable plate and the lifting plate are in sliding connection with the four guide rods, and the guide rods play a limiting and guiding role in the movable plate and the lifting plate.
Preferably, the bottom of the transparent display box is provided with a plurality of pipeline ports, the pipeline ports are in threaded connection with pipeline covers, the bottom of the base is fixedly connected with a plurality of ground feet, and the pipeline ports are used for placing living organisms.
Compared with the prior art, the invention has the advantages that:
(1) according to the scheme, the appliance body is moved to a proper position through the idler wheels, the multi-side rods are pulled, so that the fixed gear is separated from the hand-operated gear, the fixing of the rotating shaft is released, the crank is shaken in the forward direction, the hand-operated gear, the rotating shaft, the gear and the rack drive the rectangular column to move upwards, the rectangular column leaves the movable plate, under the elastic action of the tension spring, the movable plate moves upwards and drives the four threaded rods to rotate in the forward direction, the four threaded rods rotate to drive the lifting plate to move upwards, the lifting plate drives the idler wheels to move upwards to leave the ground, and the stability of the base is improved through;
(2) according to the scheme, the crank is continuously shaken, so that the heights of the transparent display box and the polygonal box can be adjusted, different height use requirements can be met, and after the crank is properly adjusted, the fixed gear is in contact with the outer side of the hand gear, so that the rotating shaft can be fixed;
(3) according to the scheme, living organisms are placed into the transparent display box through the pipeline port, the specimen can be fixed on the outer side of the multilateral box through the matching of the multilateral box and the plurality of magnetic blocks, the display can be facilitated, the observation can be conveniently and visually performed, and the learning interest can be improved;
(4) when the angles of the transparent display box and the polygonal boxes need to be adjusted, the transparent display box is pressed, the transparent display box drives the round-head rods to move downwards through the cylinders and the annular blocks to be separated from the round grooves, the transparent display box can be rotated, and different angle observation can be met;
(5) after the adjustment is proper, the transparent display box is loosened, and the circular head rod is driven by the cylinder through the annular block to enter the corresponding circular groove under the elastic force action of the spring, so that the stability of the cylinder can be improved;
(6) after the show is accomplished, this scheme is through relieving the fixed to the rotation axis, and the crank is waved in the reverse direction for rectangle post downstream extrudees the fly leaf, and the fly leaf drives four threaded rod antiport, makes the lifter plate downstream, makes four gyro wheels all with ground contact, can conveniently remove.
The invention has convenient operation, convenient movement and fixation, convenient display of biological specimens or living organisms, effective comparison of living things and specimens, visual introduction and improvement of learning interest.
Drawings
FIG. 1 is a schematic structural diagram of a display system for biological teaching according to the present invention;
FIG. 2 is a schematic structural view of part A of a display system for biological teaching according to the present invention;
FIG. 3 is a schematic structural diagram of part B of a display system for biological teaching according to the present invention;
FIG. 4 is a schematic perspective view of a polygonal box of the display device system for biological teaching according to the present invention;
FIG. 5 is a schematic view of the internal top view of the transparent display box of the display device system for biological teaching according to the present invention;
fig. 6 is a schematic perspective view of a rectangular column of the display system for biological teaching according to the present invention.
In the figure: the multifunctional folding table comprises a base 1, a rectangular column 2, a supporting box 3, a transparent display box 4, a polygonal box 5, a magnetic block 6, a turnover cover 7, a partition plate 8, a square rod 9, a cylinder 10, a square groove 11, a spring 12, a ring block 13, a round-head rod 14, a round-head groove 15, a connecting box 16, a hand gear 17, a rack 18, a through hole 19, a rotating shaft 20, a driving gear 21, a crank 22, a polygonal rod 23, a fixed gear 24, a movable plate 25, a tension spring 26, a lifting plate 27, a guide rod 28, a threaded rod 29 and a roller 30.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example one
Referring to fig. 1-6, a display device system for biological teaching, comprising a base 1, a rectangular column 2 movably connected to the base 1, a supporting box 3 fixedly connected to the top of the rectangular column 2, a transparent display box 4 movably connected to the top of the supporting box 3, the transparent display box 4 being a cylindrical structure, a plurality of partition plates 8 fixedly connected to the inside of the transparent display box 4, a supporting column rotatably mounted to the top of the transparent display box 4, a polygonal box 5 fixedly connected to the top of the supporting column, a flip cover 7 rotatably mounted to the top of the polygonal box 5, a plurality of magnetic blocks 6 adsorbed to the outside of the polygonal box 5, a connecting box 16 fixedly connected to the top of the base 1, a rotating shaft 20 slidably connected to the rectangular column 2, a driving gear 21 fixedly mounted to the outside of the rotating shaft 20, and a through hole 19 formed in the rectangular column 2, fixedly connected with rack 18 on one side inner wall of through-hole 19, rotation axis 20 runs through-hole 19, drive gear 21 and rack 18 meshing, the end mouth groove is seted up to the bottom of base 1, sliding mounting has fly leaf 25 and lifter plate 27 in the end mouth groove, four gyro wheels 30 of bottom fixedly connected with of lifter plate 27, rotate on the top inner wall in end mouth groove and install four threaded rods 29, fly leaf 25 and lifter plate 27 all with threaded rods 29 threaded connection, rectangular column 2 extends to the end mouth inslot and with fly leaf 25 looks adaptation.
In this embodiment, support vertical swing joint has cylinder 10 on the box 3, square groove 11 has been seted up to the bottom of cylinder 10, and slidable mounting has square pole 9 in square groove 11, and the bottom of square pole 9 rotates with the bottom inner wall that supports box 3 to be connected, and fixed mounting has same spring 12 between square pole 9 and the square groove 11, and spring 12 provides ascending elasticity for cylinder 10 through the support of square pole 9.
In this embodiment, the fixed cover in outside of cylinder 10 is equipped with annular block 13, and a plurality of button head poles 14 of the top fixedly connected with of annular block 13 have evenly seted up a plurality of slots 15 on the top inner wall of support box 3, and button head pole 14 and the 15 looks adaptations of the slot that correspond, the stability that can increase cylinder 10 in the round slot 15 is got into to button head pole 14.
In this embodiment, a hand gear 17 is fixedly connected to one end of the rotating shaft 20, and a crank 22 is rotatably mounted at an eccentric position of the hand gear 17.
In this embodiment, the connection box 16 is provided with a polygonal rod 23 in a transverse sliding manner, a fixed gear 24 is fixedly sleeved on the outer side of the polygonal rod 23, the fixed gear 24 is matched with the hand gear 17, the rotating shaft 20 can be fixed when the fixed gear 24 is in contact with the outer side of the hand gear 17, and the fixing of the rotating shaft 20 can be released when the fixed gear 24 is separated from the hand gear 17.
In this embodiment, the top of the movable plate 25 is fixedly connected with one end of a plurality of tension springs 26, the other end of each of the plurality of tension springs 26 is fixedly connected with the inner wall of the top of the bottom opening groove, and the tension springs 26 provide upward tension for the movable plate 25.
In this embodiment, four guide rods 28 are fixedly mounted on the inner wall of the top of the bottom opening groove, the movable plate 25 and the lifting plate 27 are both slidably connected with the four guide rods 28, and the guide rods 28 play a role in limiting and guiding the movable plate 25 and the lifting plate 27.
In this embodiment, the bottom of transparent show box 4 is provided with a plurality of pipeline mouths, and threaded connection has the pipeline lid on the pipeline mouth, and a plurality of lower margins of bottom fixedly connected with of base 1, the pipeline mouth is used for putting into the live body biology.
Example two
Referring to fig. 1-6, a display device system for biological teaching, comprising a base 1, a rectangular column 2 movably connected to the base 1, a support box 3 fixedly connected to the top of the rectangular column 2 through screws, a transparent display box 4 movably connected to the top of the support box 3, the transparent display box 4 being of a cylindrical structure, a plurality of partition plates 8 fixedly connected to the inside of the transparent display box 4 through screws, a support column rotatably mounted on the top of the transparent display box 4 through a bearing, a polygonal box 5 fixedly connected to the top of the support column through screws, a flip cover 7 rotatably mounted on the top of the polygonal box 5, a plurality of magnetic blocks 6 adsorbed on the outside of the polygonal box 5, a connection box 16 fixedly connected to the top of the base 1 through screws, the rectangular column 2 slidably connected to the connection box 16, a rotation shaft 20 transversely rotatably mounted in the connection box 16, a drive gear 21 fixedly mounted on the outside of the rotation shaft 20, through hole 19 has been seted up on rectangular column 2, through screw fixedly connected with rack 18 on one side inner wall of through hole 19, rotation axis 20 runs through hole 19, drive gear 21 and rack 18 meshing, a fore shaft groove is seted up to the bottom of base 1, sliding mounting has fly leaf 25 and lifter plate 27 in the fore shaft groove, four gyro wheels 30 of screw fixedly connected with are passed through to the bottom of lifter plate 27, rotate on the top inner wall in fore shaft groove and install four threaded rods 29, fly leaf 25 and lifter plate 27 all with threaded rod 29 threaded connection, rectangular column 2 extends to the fore shaft inslot and with fly leaf 25 looks adaptation.
In this embodiment, support vertical swing joint has cylinder 10 on the box 3, square groove 11 has been seted up to the bottom of cylinder 10, and slidable mounting has square pole 9 in square groove 11, and the bottom of square pole 9 rotates with the bottom inner wall that supports box 3 to be connected, installs same spring 12 through welded fastening between square pole 9 and the square groove 11, and spring 12 provides ascending elasticity for cylinder 10 through the support of square pole 9.
In this embodiment, the fixed cover in outside of cylinder 10 is equipped with annular block 13, and a plurality of button head poles 14 of screw fixedly connected with are passed through at annular block 13's top, evenly seted up a plurality of slots 15 on the top inner wall of support box 3, and button head pole 14 and the 15 looks adaptations of corresponding slot, the stability that can increase cylinder 10 in the round slot 15 is got into to button head pole 14.
In this embodiment, a hand gear 17 is fixedly connected to one end of the rotating shaft 20 through a screw, and a crank 22 is rotatably mounted at an eccentric position of the hand gear 17.
In this embodiment, the connection box 16 is provided with a polygonal rod 23 in a transverse sliding manner, a fixed gear 24 is fixedly sleeved on the outer side of the polygonal rod 23, the fixed gear 24 is matched with the hand gear 17, the rotating shaft 20 can be fixed when the fixed gear 24 is in contact with the outer side of the hand gear 17, and the fixing of the rotating shaft 20 can be released when the fixed gear 24 is separated from the hand gear 17.
In this embodiment, the top of the movable plate 25 is fixedly connected with one end of a plurality of tension springs 26 through screws, the other ends of the plurality of tension springs 26 are fixedly connected with the inner wall of the top with a bottom slot through screws, and the tension springs 26 provide upward tension for the movable plate 25.
In this embodiment, four guide rods 28 are fixedly installed on the inner wall of the top of the bottom opening groove by welding, the movable plate 25 and the lifting plate 27 are both connected with the four guide rods 28 in a sliding manner, and the guide rods 28 play a role in limiting and guiding the movable plate 25 and the lifting plate 27.
In this embodiment, the bottom of transparent show box 4 is provided with a plurality of pipeline mouths, and threaded connection has the pipeline lid on the pipeline mouth, and a plurality of lower margins of screw fixedly connected with are passed through to the bottom of base 1, and the pipeline mouth is used for putting into the live body biology.
In the embodiment, when the multifunctional hand-cranking base is used, the appliance body is moved to a proper position through the roller 30, the multi-side rod 23 is pulled, the fixed gear 24 is separated from the hand-cranking gear 17, the fixing of the rotating shaft 20 is released, the crank 22 is shaken in the forward direction, the hand-cranking gear 17 drives the gear 21 to rotate through the rotating shaft 20, the gear 21 drives the rectangular column 2 to move upwards through the rack 18, the rectangular column 2 leaves the movable plate 25, the movable plate 25 moves upwards under the elastic action of the tension spring 26, the movable plate 25 drives the four threaded rods 29 to rotate in the forward direction, the four threaded rods 29 rotate to drive the lifting plate 27 to move upwards, the lifting plate 27 drives the roller 30 to move upwards to leave the ground, the stability of the base 1 is improved through the ground feet, the stability of the using appliance can be improved, the crank 22 is continuously shaken, the heights of the transparent display box, after the adjustment is proper, the fixed gear 24 is in contact with the outer side of the hand gear 17, the rotating shaft 20 can be fixed, living organisms are placed into the transparent display box 4 through a pipeline port, a specimen can be fixed on the outer side of the polygonal box 5 through the matching of the polygonal box 5 and the plurality of magnetic blocks 6, the living organisms can be conveniently displayed, tools can be placed in the polygonal box 5, the living organisms are displayed through the transparent display box 4, the specimen is displayed through the polygonal box 5, the contrast can be formed, the visual observation is convenient, when the angle between the transparent display box 4 and the polygonal box 5 needs to be adjusted, the transparent display box 4 is pressed, the transparent display box 4 drives the plurality of round-head rods 14 to move downwards through the cylinders 10 and the annular blocks 13 to be separated from the circular grooves 15, the fixation of the cylinders 10 is released, the transparent display box 4 is rotated, after the adjustment is proper, the transparent display box 4 is loosened, under the spring action of spring 12, cylinder 10 drives button head pole 14 through annular piece 13 and gets into the stability that can increase cylinder 10 in the corresponding circular slot 15, and the show is accomplished the back, removes the fixed to rotation axis 20, and reverse rocking crank 22 for rectangular column 2 downstream extrudees fly leaf 25, and fly leaf 25 drives four threaded rod 29 antiport, makes lifter plate 27 downstream, makes four gyro wheels 30 all with ground contact, can conveniently remove.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. A display apparatus system for biological teaching comprises a base (1) and is characterized in that a rectangular column (2) is movably connected onto the base (1), a supporting box (3) is fixedly connected onto the top of the rectangular column (2), a transparent display box (4) is movably connected onto the top of the supporting box (3), the transparent display box (4) is of a cylindrical structure, a plurality of partition plates (8) are fixedly connected into the transparent display box (4), a supporting column is rotatably installed at the top of the transparent display box (4), a multi-side box (5) is fixedly connected onto the top of the supporting column, a turnover cover (7) is rotatably installed at the top of the multi-side box (5), a plurality of magnetic blocks (6) are adsorbed onto the outer side of the multi-side box (5), a connecting box (16) is fixedly connected onto the top of the base (1), the rectangular column (2) is slidably connected with the connecting box (16), a rotating shaft (20) is transversely rotatably installed in the connecting, the fixed cover in outside of rotation axis (20) is equipped with drive gear (21), through hole (19) have been seted up on rectangular column (2), fixedly connected with rack (18) on one side inner wall of through hole (19), rotation axis (20) run through hole (19), drive gear (21) and rack (18) meshing, the bottom in base (1) is seted up the end mouth groove, sliding mounting has fly leaf (25) and lifter plate (27) in the end mouth groove, four gyro wheels (30) of bottom fixedly connected with of lifter plate (27), rotate on the top inner wall in end mouth groove and install four threaded rods (29), fly leaf (25) and lifter plate (27) all with threaded rod (29) threaded connection, rectangular column (2) extend to the end mouth inslot and with fly leaf (25) looks adaptation.
2. The display apparatus system for biological teaching according to claim 1, wherein the supporting box (3) is longitudinally movably connected with a cylinder (10), a square groove (11) is formed in the bottom of the cylinder (10), a square rod (9) is slidably mounted in the square groove (11), the bottom end of the square rod (9) is rotatably connected with the inner wall of the bottom of the supporting box (3), and a same spring (12) is fixedly mounted between the square rod (9) and the square groove (11).
3. The display device system for biological teaching as claimed in claim 1, wherein the outer side of the cylinder (10) is fixedly sleeved with an annular block (13), the top of the annular block (13) is fixedly connected with a plurality of round-head rods (14), the inner wall of the top of the supporting box (3) is uniformly provided with a plurality of round grooves (15), and the round-head rods (14) are matched with the corresponding round grooves (15).
4. The display system for biological teaching as claimed in claim 1, wherein a hand gear (17) is fixedly connected to one end of the rotating shaft (20), and a crank (22) is rotatably installed at an eccentric position of the hand gear (17).
5. The display system for biological teaching as claimed in claim 1, wherein a polygonal rod (23) is transversely slidably mounted on the connecting box (16), a fixed gear (24) is fixedly sleeved on the outer side of the polygonal rod (23), and the fixed gear (24) is matched with the hand gear (17).
6. The display system for biological teaching as claimed in claim 1, wherein one end of a plurality of tension springs (26) is fixedly connected to the top of the movable plate (25), and the other end of each tension spring (26) is fixedly connected to the inner wall of the top of the bottom opening groove.
7. The display system for biological teaching as claimed in claim 1, wherein four guide rods (28) are fixedly mounted on the inner wall of the top of the bottom opening groove, and the movable plate (25) and the lifting plate (27) are slidably connected with the four guide rods (28).
8. The display system for biological teaching as claimed in claim 1, wherein the bottom of the transparent display box (4) is provided with a plurality of pipeline ports, the pipeline ports are connected with pipeline covers in a threaded manner, and the bottom of the base (1) is fixedly connected with a plurality of ground feet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010185849.6A CN111199671A (en) | 2020-03-17 | 2020-03-17 | Display apparatus system for biological teaching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010185849.6A CN111199671A (en) | 2020-03-17 | 2020-03-17 | Display apparatus system for biological teaching |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111199671A true CN111199671A (en) | 2020-05-26 |
Family
ID=70747358
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010185849.6A Withdrawn CN111199671A (en) | 2020-03-17 | 2020-03-17 | Display apparatus system for biological teaching |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111199671A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111970876A (en) * | 2020-09-01 | 2020-11-20 | 济南万象轩智能科技有限公司 | Interactive Chinese teaching equipment of intelligent foreign Chinese inquiry machine |
| CN112967568A (en) * | 2021-02-07 | 2021-06-15 | 赣南医学院 | Marketing teaching contrast learning device |
| CN113257084A (en) * | 2021-06-01 | 2021-08-13 | 承德石油高等专科学校 | Teaching display device |
-
2020
- 2020-03-17 CN CN202010185849.6A patent/CN111199671A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111970876A (en) * | 2020-09-01 | 2020-11-20 | 济南万象轩智能科技有限公司 | Interactive Chinese teaching equipment of intelligent foreign Chinese inquiry machine |
| CN112967568A (en) * | 2021-02-07 | 2021-06-15 | 赣南医学院 | Marketing teaching contrast learning device |
| CN112967568B (en) * | 2021-02-07 | 2022-08-09 | 赣南医学院 | Marketing teaching contrast learning device |
| CN113257084A (en) * | 2021-06-01 | 2021-08-13 | 承德石油高等专科学校 | Teaching display device |
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Application publication date: 20200526 |