CN114312111B - Blackboard for English teaching - Google Patents
Blackboard for English teaching Download PDFInfo
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- CN114312111B CN114312111B CN202210104984.2A CN202210104984A CN114312111B CN 114312111 B CN114312111 B CN 114312111B CN 202210104984 A CN202210104984 A CN 202210104984A CN 114312111 B CN114312111 B CN 114312111B
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Abstract
The invention discloses a blackboard for English teaching, wherein a U-shaped fixed seat is arranged on the back surface of a panel, a supporting rod is arranged between two U-shaped ends of the fixed seat, and a connecting rod is arranged through a first fixed hole and a second fixed hole; a plurality of first fixing grooves are formed in the inner sides of the first fixing holes, second fixing grooves are formed in the inner sides of the second fixing holes, limiting convex edges matched with the first fixing grooves and the second fixing grooves are formed in the outer sides of one ends of the connecting rods, and nuts are connected to the other ends of the connecting rods in a threaded mode; the lower end of the supporting rod is provided with a base. Through the meshing rotation of first gear and second gear, can carry out accurate adjustment to the contained angle between bracing piece and the panel, prevent to rotate between bracing piece and the fixing base too nimble angle that leads to not good the affirmation to reduce the adjustment degree of difficulty, shortened the adjustment time when using long, guaranteed the teaching time, improved teaching effect and teaching quality.
Description
Technical Field
The invention relates to the technical field of English teaching tools, in particular to a blackboard for English teaching.
Background
People always obtain information through various senses, wherein the vision accounts for 83% of all the sense information, so the blackboard is a necessary product in various English teaching, plays a very important role in the English teaching, not only plays a role in providing visual information for students, but also can enable knowledge to be more firmly reserved in memory.
Present blackboard all is fixed the setting usually, can not carry out inclination's regulation, and along with the constantly changing of indoor light like this, the condition of reflection of light probably appears in the blackboard, very big influence teaching effect, and some blackboards can carry out angular adjustment, but the regulation precision is not enough, and the adjustment process waste time is to the teaching time who just is not abundant in the past discounting greatly.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: to the not enough that prior art exists, provide a blackboard for english teaching, can be convenient adjust the inclination of blackboard, and the adjustment precision is high.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a blackboard for English teaching comprises a panel for writing, wherein a U-shaped fixed seat is arranged on the back of the panel, a supporting rod is arranged between two U-shaped ends of the fixed seat, a first gear is arranged at the top end of the supporting rod, a second gear is arranged between the two U-shaped ends of the fixed seat, and the first gear is matched with the second gear;
the two U-shaped ends of the fixed seat are respectively provided with a first fixing hole which penetrates through the U-shaped ends, the top end of the supporting rod is provided with a second fixing hole which is matched with the first fixing hole, and a connecting rod is arranged through the first fixing hole and the second fixing hole;
a plurality of first fixing grooves are formed in the inner sides of the first fixing holes, second fixing grooves are formed in the inner sides of the second fixing holes, limiting convex edges matched with the first fixing grooves and the second fixing grooves are formed in the outer sides of one ends of the connecting rods, and nuts are connected to the other ends of the connecting rods in a threaded mode;
the lower end of the supporting rod is provided with a base.
Preferably, a groove opening direction of the first fixing groove is identical to a gear direction of the first gear and the second gear.
Preferably, one end of the connecting rod is provided with a pull handle.
Preferably, the lower part of the support rod is hollow, and a fixing rod is sleeved on the inner side of the lower part of the support rod;
the utility model discloses a bracing piece, including bracing piece, adjusting sleeve, adjusting screw, adjusting bolt, adjusting sleeve, base, adjusting screw, adjusting bolt, adjusting sleeve, the lower part outside of bracing piece is equipped with the adjusting sleeve, the outside of adjusting sleeve is equipped with the sleeve pipe, the sleeve pipe with the adjusting sleeve passes through bolt fixed connection, adjusting screw has been seted up to sheathed tube one side, be equipped with adjusting bolt in the adjusting screw, adjusting bolt's top with the adjusting sleeve butt, one side of adjusting sleeve is run through and is equipped with the expansion joint, sheathed tube bottom with base fixed connection.
Preferably, the bottom of the supporting rod is provided with a first bearing, the supporting rod is abutted against an inner ring of the first bearing, the bottom of the fixed rod is provided with a second bearing, and the second bearing is sleeved on the outer side of the fixed rod;
the inner side of the sleeve is respectively provided with a mounting groove for mounting a first bearing and a second bearing, the lower part of the inner ring of the second bearing is provided with a fixing plate, and the fixing plate is connected with the fixing rod through a bolt.
Preferably, the upper part of the sleeve is provided with an annular cover plate, and the cover plate is connected with the sleeve through a bolt.
Preferably, the fixing rod and the supporting rod are fixedly connected through a pin shaft.
Preferably, the bottom of the fixed plate is provided with universal wheels. The universal wheel comprises two symmetrically arranged guard plates and a rotating wheel arranged between the two guard plates, a brake pad is arranged on the guard plates in a rotating mode, and a plurality of brake sawteeth matched with the rotating wheel are arranged at the free end of the brake pad.
Preferably, a rotating handle is arranged on the outer side of the supporting rod.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
the blackboard for English teaching comprises a panel for writing, wherein a U-shaped fixed seat is arranged on the back of the panel, a supporting rod is arranged between two U-shaped ends of the fixed seat, a first gear is arranged at the top end of the supporting rod, a second gear is arranged between the two U-shaped ends of the fixed seat, and the first gear is matched with the second gear; the two U-shaped ends of the fixed seat are respectively provided with a first fixing hole which penetrates through the U-shaped ends, the top end of the supporting rod is provided with a second fixing hole which is matched with the first fixing hole, and a connecting rod is arranged through the first fixing hole and the second fixing hole; a plurality of first fixing grooves are formed in the inner sides of the first fixing holes, second fixing grooves are formed in the inner sides of the second fixing holes, limiting convex edges matched with the first fixing grooves and the second fixing grooves are formed in the outer sides of one ends of the connecting rods, and nuts are connected to the other ends of the connecting rods in a threaded mode; the lower end of the supporting rod is provided with a base. Through the meshing rotation of first gear and second gear, can carry out accurate adjustment to the contained angle between bracing piece and the panel, prevent to rotate between bracing piece and the fixing base too nimble to lead to the angle not well to confirm to reduce the adjustment degree of difficulty, shortened the adjustment time length when using, guaranteed the teaching time, improved teaching effect and teaching quality.
The direction of the groove of the first fixing groove is consistent with the gear directions of the first gear and the second gear. The rotation range of connecting rod in first fixed orifices is unanimous with the rotation range of panel promptly, and along with the meshing rotation of first gear and second gear, spacing bead can both be established in the first fixed slot that corresponds by the card at every turn, and spacing bead card is established in first fixed slot and second fixed slot respectively, makes and can not rotate between bracing piece and the panel, has realized the fixed of panel.
The one end of connecting rod is equipped with the pull handle, can be convenient take the connecting rod out, the adjustment of the panel inclination of being convenient for.
The lower part of the supporting rod is arranged in a hollow mode, and a fixing rod is sleeved on the inner side of the lower part of the supporting rod; an adjusting sleeve is arranged on the outer side of the lower part of the supporting rod, a sleeve is arranged on the outer side of the adjusting sleeve, the sleeve is fixedly connected with the adjusting sleeve through a bolt, an adjusting screw hole is formed in one side of the sleeve, adjusting bolts are arranged in the adjusting screw holes, the tops of the adjusting bolts are abutted to the adjusting sleeves, expansion joints are arranged on one sides of the adjusting sleeves in a penetrating mode, and the bottoms of the sleeves are fixedly connected with the base. The supporting rod arranged in the hollow mode greatly reduces the weight of the equipment, and the equipment is convenient to move. The relative base of bracing piece can carry out the rotation of circumference, can adjust with the orientation of counterplate, and the expansion joint makes adjusting collar circumference have flexible surplus, supports tightly or unclamps the adjusting collar through adjusting bolt, can adjust the frictional force between adjusting collar and the bracing piece to resistance when changing the bracing piece and rotating makes the bracing piece rotate around the sleeve pipe under the artificial rotation, nevertheless can not oneself rotate at will.
The bottom of the supporting rod is provided with a first bearing, the supporting rod is abutted against an inner ring of the first bearing, the bottom of the fixed rod is provided with a second bearing, and the second bearing is sleeved on the outer side of the fixed rod; the inner side of the sleeve is respectively provided with a mounting groove for mounting a first bearing and a second bearing, the lower part of the inner ring of the second bearing is provided with a fixing plate, and the fixing plate is connected with the fixing rod through a bolt. The first bearing and the second bearing ensure that the supporting rod and the fixing rod can rotate around the sleeve more smoothly.
And the upper part of the sleeve is provided with an annular cover plate, and the cover plate is connected with the sleeve through a bolt. The inner ring of the annular cover plate can provide circumferential fixing force for the supporting rod, and meanwhile, sundries can be prevented from entering the sleeve.
The fixed rod is fixedly connected with the supporting rod through a pin shaft, so that the supporting rod and the fixed rod can integrally rotate.
The bottom of the fixed plate is provided with universal wheels. The universal wheel comprises two symmetrically arranged guard plates and a rotating wheel arranged between the two guard plates, a brake block is arranged on the guard plates in a rotating mode, and a plurality of brake sawteeth matched with the rotating wheel are arranged at the free end of the brake block. The universal wheel can make the blackboard more light when removing, and the use place is nimble, and the brake sawtooth then can carry out firm fixed to the runner, prevents that the universal wheel from rotating at will in the use.
The outside of bracing piece is equipped with twist grip, and is more convenient when adjusting the orientation of panel.
Drawings
Fig. 1 is a perspective view of an embodiment of the present invention.
FIG. 2 is a perspective view of an alternate aspect of an embodiment of the present invention;
FIG. 3 is a front view of an embodiment of the present invention;
FIG. 4 isbase:Sub>A cross-sectional view taken along A-A of FIG. 3;
FIG. 5 is an exploded view of an embodiment of the present invention;
FIG. 6 is an enlarged view of FIG. 5 at B;
FIG. 7 is an enlarged view of FIG. 5 at C;
wherein: 1. a panel; 2. a fixed seat; 3. a support bar; 4. a first gear; 5. a second gear; 6. a connecting rod; 7. a first fixing groove; 8. a second fixing groove; 9. a limit bead; 10. a nut; 11. a base; 12. pulling a handle; 13. a fixing rod; 14. an adjusting sleeve; 15. a sleeve; 16. adjusting the screw hole; 17. adjusting the bolt; 18. an expansion joint; 19. a first bearing; 20. a second bearing; 21. a fixing plate; 22. a cover plate; 23. a pin shaft; 24. a universal wheel; 25. a rotating wheel; 26. a guard plate; 27. a brake pad; 28. a brake serration; 29. the handle is rotated.
Detailed Description
The invention is further illustrated by the following examples.
As shown in fig. 1-7, a blackboard for english teaching, includes a panel 1 for writing, a U-shaped fixing seat 2 is provided on the back of the panel 1, and the fixing seat 2 and the panel 1 are fixedly connected together by bolts. A supporting rod 3 is arranged between the two U-shaped ends of the fixed seat 2, a first gear 4 is arranged at the top end of the supporting rod 3, a second gear 5 is arranged between the two U-shaped ends of the fixed seat 2, in the embodiment, the first gear 4 and the second gear 5 are both half gears, and the first gear 4 is matched with the second gear 5; the two U-shaped ends of the fixed seat 2 are respectively provided with a first fixing hole which penetrates through the U-shaped ends, the top end of the supporting rod 3 is provided with a second fixing hole which is matched with the first fixing hole, a connecting rod 6 penetrates through the first fixing hole and the second fixing hole, and the fixed seat 2 and the supporting rod 3 are fixed together by the connecting rod 6; a plurality of first fixing grooves 7 are formed in the inner side of each first fixing hole, a second fixing groove 8 is formed in the inner side of each second fixing hole, a limiting convex edge 9 which is matched with the first fixing groove 7 and the second fixing groove 8 in shape is formed in the outer side of one end of the connecting rod 6, and a nut 10 is connected to the other end of the connecting rod 6 in a threaded mode; the lower end of the support rod 3 is provided with a base 11. Through the meshing rotation of first gear 4 and second gear 5, can carry out accurate adjustment to the contained angle between bracing piece 3 and the panel 1, prevent to rotate too in a flexible way between bracing piece 3 and the fixing base 2 and lead to the angle not well to confirm, increased the adjustment degree of difficulty, adjust time length during the use, compressed teaching time, make teaching effect and teaching quality discount greatly.
The groove direction of the first fixing groove 7 coincides with the gear direction of the first gear 4 and the second gear 5. That is, the rotation range of connecting rod 6 when engaging with different first fixed slot 7 in first fixed orifices is unanimous with panel 1's rotation range, along with the meshing rotation of first gear 4 and second gear 5, spacing bead 9 can both block at every turn and establish in corresponding first fixed slot 7, spacing bead 9 blocks respectively and establishes in first fixed slot 7 and second fixed slot 8, make and can not rotate between bracing piece 3 and the panel 1, it is equipped with two to have realized that panel 1's fixed spacing bead 9 symmetry is equipped with two in this embodiment for fixed firm, second fixed slot 8 also symmetry is equipped with two.
One end of the connecting rod 6 is provided with a pull handle 12, so that the connecting rod 6 can be conveniently pulled out, and the inclination angle of the panel 1 can be conveniently adjusted.
The lower part of the support rod 3 is arranged in a hollow mode, and a fixing rod 13 is sleeved on the inner side of the lower part of the support rod 3; the utility model discloses a bracing piece, including bracing piece 3, adjusting sleeve 14, adjusting screw 16, adjusting bolt 17, adjusting bolt 14, adjusting sleeve 15 and adjusting sleeve 14 pass through bolt fixed connection, adjusting screw 16 has been seted up to one side of sleeve 15, be equipped with adjusting bolt 17 in the adjusting screw 16, adjusting bolt 17's top with adjusting sleeve 14 butt, one side of adjusting sleeve 14 is run through and is equipped with expansion joint 18, the bottom of sleeve 15 with base 11 fixed connection. The supporting rod 3 arranged in the hollow mode greatly reduces the weight of the equipment, and the equipment is convenient to move. The relative base 11 of bracing piece 3 can carry out the rotation of circumference, can adjust the orientation of panel 1, the expansion joint 18 makes adjusting sleeve 14 circumference have flexible surplus, support tight or loosen adjusting sleeve 14 through adjusting bolt 17, can adjust the frictional force between adjusting sleeve 14 and the bracing piece 3, thereby resistance when changing bracing piece 3 and rotating makes bracing piece 3 rotate around sleeve pipe 15 under the artificial rotation, nevertheless can not oneself rotate at will.
A first bearing 19 is arranged at the bottom of the support rod 3, the support rod 3 is abutted against an inner ring of the first bearing 19, a second bearing 20 is arranged at the bottom of the fixed rod 13, and the second bearing 20 is sleeved on the outer side of the fixed rod 13; the inner side of the sleeve 15 is respectively provided with a mounting groove for mounting a first bearing 19 and a second bearing 20, the lower part of the inner ring of the second bearing 20 is provided with a fixing plate 21, and the fixing plate 21 and the fixing rod 13 are connected through a bolt. The first bearing 19 and the second bearing 20 ensure that the support rod 3 and the fixing rod 13 can rotate around the sleeve 15 more smoothly.
The upper part of the sleeve 15 is provided with an annular cover plate 22, and the cover plate 22 is connected with the sleeve 15 through bolts. The inner ring of the annular cover plate 22 can provide circumferential fixing force for the support rod 3 and can prevent impurities from entering the sleeve 15.
The fixing rod 13 and the supporting rod 3 are fixedly connected through a pin 23, so that the supporting rod 3 and the fixing rod 13 can integrally rotate.
The bottom of the fixed plate 21 is provided with universal wheels 24. The universal wheel 24 comprises two symmetrically arranged guard plates 26 and a rotating wheel 25 arranged between the two guard plates 26, a brake pad 27 is rotatably arranged on the guard plates 26, and a plurality of brake sawteeth 28 matched with the rotating wheel 25 are arranged at the free end of the brake pad 27. The universal wheel 24 can make the blackboard move more easily and the use place flexible, and the brake saw teeth 28 can firmly fix the rotating wheel 25 to prevent the universal wheel 24 from rotating randomly in the use process.
The outside of bracing piece 3 is equipped with twist grip 29, and is more convenient when adjusting panel 1's orientation.
It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention can be made by those skilled in the art after reading the teaching of the present invention, and these equivalents also fall within the scope of the claims appended to the present application.
Claims (9)
1. The utility model provides a blackboard is used in english teaching, is including the panel that is used for writing, its characterized in that: a U-shaped fixed seat is arranged on the back of the panel, a supporting rod is arranged between two U-shaped ends of the fixed seat, a first gear is arranged at the top end of the supporting rod, a second gear is arranged between the two U-shaped ends of the fixed seat, and the first gear is matched with the second gear;
the two U-shaped ends of the fixed seat are respectively provided with a first fixing hole which penetrates through the U-shaped ends, the top end of the supporting rod is provided with a second fixing hole which is matched with the first fixing hole, and a connecting rod is arranged through the first fixing hole and the second fixing hole;
a plurality of first fixing grooves are formed in the inner sides of the first fixing holes, second fixing grooves are formed in the inner sides of the second fixing holes, limiting convex edges matched with the first fixing grooves and the second fixing grooves are formed in the outer sides of one ends of the connecting rods, and nuts are connected to the other ends of the connecting rods in a threaded mode;
the lower end of the supporting rod is provided with a base;
the lower part of the supporting rod is arranged in a hollow mode, and a fixing rod is sleeved on the inner side of the lower part of the supporting rod;
an adjusting sleeve is arranged on the outer side of the lower part of the supporting rod, a sleeve is arranged on the outer side of the adjusting sleeve, the sleeve is fixedly connected with the adjusting sleeve through a bolt, an adjusting screw hole is formed in one side of the sleeve, adjusting bolts are arranged in the adjusting screw holes, the tops of the adjusting bolts are abutted to the adjusting sleeves, expansion joints are arranged on one sides of the adjusting sleeves in a penetrating mode, and the bottoms of the sleeves are fixedly connected with the base.
2. The blackboard for english teaching according to claim 1, characterized in that: the slotting direction of the first fixing groove is consistent with the gear direction of the first gear and the second gear.
3. The blackboard for english teaching according to claim 1, characterized in that: one end of the connecting rod is provided with a pull handle.
4. The blackboard for english teaching according to claim 1, characterized in that: the bottom of the supporting rod is provided with a first bearing, the supporting rod is abutted against an inner ring of the first bearing, the bottom of the fixed rod is provided with a second bearing, and the second bearing is sleeved on the outer side of the fixed rod;
the inner side of the sleeve is respectively provided with a mounting groove for mounting a first bearing and a second bearing, the lower part of the inner ring of the second bearing is provided with a fixing plate, and the fixing plate is connected with the fixing rod through a bolt.
5. The blackboard for english teaching according to claim 1, characterized in that: and the upper part of the sleeve is provided with an annular cover plate, and the cover plate is connected with the sleeve through a bolt.
6. The blackboard for english teaching according to claim 1, characterized in that: the fixed rod is fixedly connected with the supporting rod through a pin shaft.
7. The blackboard for english teaching according to claim 1, characterized in that: the bottom of the base is provided with universal wheels.
8. The blackboard for english teaching according to claim 7, characterized in that: the universal wheel comprises two symmetrically arranged guard plates and a rotating wheel arranged between the two guard plates, a brake pad is arranged on the guard plates in a rotating mode, and a plurality of brake sawteeth matched with the rotating wheel are arranged at the free end of the brake pad.
9. The blackboard for english teaching according to claim 1, characterized in that: and a rotating handle is arranged on the outer side of the supporting rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210104984.2A CN114312111B (en) | 2022-01-28 | 2022-01-28 | Blackboard for English teaching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210104984.2A CN114312111B (en) | 2022-01-28 | 2022-01-28 | Blackboard for English teaching |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114312111A CN114312111A (en) | 2022-04-12 |
| CN114312111B true CN114312111B (en) | 2023-02-24 |
Family
ID=81031095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210104984.2A Active CN114312111B (en) | 2022-01-28 | 2022-01-28 | Blackboard for English teaching |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114312111B (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000300140A (en) * | 1999-04-23 | 2000-10-31 | Zaitetsu Kin | Angle adjusting device for fishing rod-supporting tool |
| JP2003299680A (en) * | 2002-04-10 | 2003-10-21 | Keiai Orthopedic Appliance Co Ltd | Joint device and joint kit |
| CN109733095A (en) * | 2019-01-17 | 2019-05-10 | 德州学院 | Multifunctional mathmatical drawing auxiliary device |
| CN209683282U (en) * | 2019-03-06 | 2019-11-26 | 邵彦慧 | A kind of adjustable blackboard for education facilitating multi-angle observation |
| CN211821596U (en) * | 2020-03-27 | 2020-10-30 | 王入仟 | Presentation device is used in computer teaching |
| CN211994869U (en) * | 2020-02-15 | 2020-11-24 | 方可扬 | Display device for financial economic analysis |
| CN213261756U (en) * | 2020-10-21 | 2021-05-25 | 山东科技职业学院 | Movable blackboard for teaching |
| CN213367691U (en) * | 2020-08-31 | 2021-06-04 | 周光军 | Base is adjusted to photovoltaic equipment modularization |
| CN213751520U (en) * | 2020-11-20 | 2021-07-20 | 石家庄铁路职业技术学院 | Demonstration teaching aid for hotel management on-site teaching |
| CN214123237U (en) * | 2021-01-06 | 2021-09-03 | 河南大学 | Teaching display board for software technology development |
| CN214202833U (en) * | 2021-02-19 | 2021-09-14 | 湖北职业技术学院 | English teaching is with show board |
| CN215182610U (en) * | 2021-04-28 | 2021-12-14 | 武汉轻工大学 | German teaching interaction device |
| CN215577028U (en) * | 2021-05-13 | 2022-01-18 | 崔翠翠 | Phrase learning teaching aid for Chinese teaching |
-
2022
- 2022-01-28 CN CN202210104984.2A patent/CN114312111B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000300140A (en) * | 1999-04-23 | 2000-10-31 | Zaitetsu Kin | Angle adjusting device for fishing rod-supporting tool |
| JP2003299680A (en) * | 2002-04-10 | 2003-10-21 | Keiai Orthopedic Appliance Co Ltd | Joint device and joint kit |
| CN109733095A (en) * | 2019-01-17 | 2019-05-10 | 德州学院 | Multifunctional mathmatical drawing auxiliary device |
| CN209683282U (en) * | 2019-03-06 | 2019-11-26 | 邵彦慧 | A kind of adjustable blackboard for education facilitating multi-angle observation |
| CN211994869U (en) * | 2020-02-15 | 2020-11-24 | 方可扬 | Display device for financial economic analysis |
| CN211821596U (en) * | 2020-03-27 | 2020-10-30 | 王入仟 | Presentation device is used in computer teaching |
| CN213367691U (en) * | 2020-08-31 | 2021-06-04 | 周光军 | Base is adjusted to photovoltaic equipment modularization |
| CN213261756U (en) * | 2020-10-21 | 2021-05-25 | 山东科技职业学院 | Movable blackboard for teaching |
| CN213751520U (en) * | 2020-11-20 | 2021-07-20 | 石家庄铁路职业技术学院 | Demonstration teaching aid for hotel management on-site teaching |
| CN214123237U (en) * | 2021-01-06 | 2021-09-03 | 河南大学 | Teaching display board for software technology development |
| CN214202833U (en) * | 2021-02-19 | 2021-09-14 | 湖北职业技术学院 | English teaching is with show board |
| CN215182610U (en) * | 2021-04-28 | 2021-12-14 | 武汉轻工大学 | German teaching interaction device |
| CN215577028U (en) * | 2021-05-13 | 2022-01-18 | 崔翠翠 | Phrase learning teaching aid for Chinese teaching |
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| Publication number | Publication date |
|---|---|
| CN114312111A (en) | 2022-04-12 |
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