Please select the most similar patent number from A, B, C and D. Which number is?
Provided is a child rocking chair, comprising lateral plates (1), a back plate (2), a sitting plate (3), a first support plate (4), a second support plate (5), a foot plate (6), a third support plate (7) and a handle rod (8), wherein two sides of the back plate (2) are respectively provided with one of the lateral plates (1) symmetrically arranged with each other, the sitting plate (3) is provided between the two lateral plates (1), and the sitting plate (3) is positioned below the back plate (2); and the first support plate (4), the second support plate (5) and the third support plate (7) are also provided between the two lateral plates (1). The rocking chair has a simple structure, is convenient to manufacture, has the function of limiting, and improves safety performance.
A: Ad anti-theft book box, comprising an inner box body and an outer paper shell that are combined. The outer paper shell wraps the exterior of the inner box body; the inner box body comprises a bottom plate (1), a back plate (11), a front plate (12), and two side plates (13); a connecting cover is rotatably connected to the top of the back plate (11) by means of a hinge shaft (15); the connecting cover comprises a rotating plate (2) and a supporting plate (21); the supporting plate (21) is located at the lower part of the rotating plate (2) and is connected to the rotating plate (2) by means of a sloping plate (22); the supporting plate (21) is provided with a lock groove (3); a coded lock is provided in the locking groove (3); the coded lock comprises a lock body (4); a locking piece (41) and a lower clip (42) are rotatably connected to the lower part of the lock body (4); the lock body (4) is provided with an upper clip (43); a clamping plate (14) is obliquely provided at the top of the front plate; the locking piece (41) is located at the lower part of the clamping plate (14) and is capable of clamping the clamping plate (14); one end of the supporting plate (21) is provided with a shelving plate (23), and the shelving plate (23) can be placed above the clamping plate (14). The anti-theft book box has reasonability in design and high safety, and is convenient to carry and use.
B: A positioning and clamping device for garment processing, the device comprising an operation table (1) and a plurality of supporting legs (2) arranged at the bottom end of the operation table (1), wherein two connecting plates (3) are arranged on the operation table (1); both ends of the connecting plate (3) located on the left side are connected to first connecting sliding rods (4); both ends of the connecting plate (3) located on the right side are connected to second connecting sliding rods (5); first sliding blocks (15) are arranged on the first connecting sliding rods (4) and the second connecting sliding rods (5), respectively; the front side face and the rear side face of the operation table (1) are respectively provided with first sliding grooves (6) for allowing the first sliding blocks (15) to slide therein; a supporting plate (12) is arranged below the operation table (1); two transmission mechanisms, which are symmetrical to the front and rear, are arranged on the supporting plate (12); each transmission mechanism comprises a first rack bar (7), a second rack bar (8) and a gear (9); bottom ends of the connecting plates (3) on the two sides are provided with clamping plates (18), respectively; and the connecting plates (3) on the two sides are provided with pushing mechanisms, respectively. The requirements for fixing garments of different sizes can be met; and by means of providing first springs (22) and second springs (26), the rigid contact between the clamping plates (18) and the surface of a garment can be avoided, such that the surface of the garment is prevented from being damaged.
C: Disclosed is a rocking chair for children, the rocking chair comprising a seat body (1), a supporting frame (2), a seat body limiting mechanism (3), a driving electric motor (5), a driving electric motor power output portion (6), and a rotating shaft (7). One end of the rotating shaft (7) is fixedly connected to the driving electric motor power output portion (6); the seat body (1) pivots around the other end of the rotating shaft (7); when the rotating shaft (7) rotates, the pivot point between the other end of the rotating shaft (7) and the seat body (1) moves relative to the fixed connection point between one end of the rotating shaft (7) and the driving electric motor power output portion (6) at a certain distance; the driving electric motor (5) and the driving electric motor power output portion (6) are arranged on a mounting box (8); the mounting box (8) is fixedly connected to the seat body (1); and the seat body limiting mechanism (3) can limit, when the driving electric motor (5) drives the rotating shaft (7), an included angle between the seat body (1) and the rotating shaft (7) to be kept within a set angle for forward and reverse rotation in a reciprocating manner. The rocking chair is simple in terms of structure, low in cost, large in terms of swing amplitude, stable in terms of seat body and capable of carrying out two different swing manners at the same time.
D: A lifting/lowering test platform and method for marine instruments and devices, the platform comprising a bottom plate (1). First side plates (2) are fixedly installed on two sides of the bottom plate (1); a first support plate (5) is slidably installed on each of the two first side plates (2); a second support plate (6) is fixedly installed on each of the two first support plates (5); a third support plate (7) is fixedly installed at the bottom of each of the two second support plates (6); a plurality of installation holes (8) are formed on both the two third support plates (7); electric push rods (9) are fixedly installed on two sides of the bottom plate (1); the output shafts of the two electric push rods (9) are respectively fixedly connected to the two second support plates (6); two second side plates (10) are symmetrically and fixedly installed on the top of the bottom plate (1); a top plate (11) is fixedly installed on the tops of the two second side plates (10); an operation plate (13) is slidably installed above the top plate (11); and two expansion plates (24) are symmetrically and slidably installed on the operation plate (13). The lifting/lowering test platform has a large operation area and high operation stability and is convenient to use.
Answer: C