Please select the most similar patent number from A, B, C and D. Which number is?
A vehicle-mounted refrigerator having an emergency starting function, comprising a refrigerator body (1). An anti-skid bottom plate (2) is fixedly mounted at the bottom of the refrigerator body (1), a movable cover plate (16) is movably mounted at the top of the refrigerator body (1), a fixed frame (7) is fixedly mounted on each of the left and right sides of the refrigerator body (1), a limiting rod (23) is fixedly mounted on each of the upper and lower sides of an inner cavity of each fixed frame (7), a buffer plate (20) is movably mounted between the two limiting rods (23), and telescopic rods (21) are fixedly mounted on the opposite sides of the left and right buffer plates (20).
A: A detachable lifting and lowering apparatus for ocean investigation and method therefor. Said lifting and lowering apparatus comprises two bearing plates (1); a fixing plate (8) is each fixedly mounted on the sides of the two bearing plates (1) close to each other; a same mounting plate (7) is slidably mounted on the outer sides of the two fixing plates (8); a motor (6) is fixedly mounted on the top of the mounting plate (7); a screw rod (5) is fixedly mounted on an output shaft of the motor (6); a lifting and lowering plate (4) is mounted on the screw rod (5) in a threaded manner; a transmission plate (3) is each slidably mounted on two sides of the lifting and lowering plate (4); a vertical plate (2) is each fixedly mounted on the sides of the two transmission plates (3) away from each other; a first placement plate (20) is fixedly mounted on one side of one of the two vertical plates (2) and a second placement plate (21) is fixedly mounted on one side of the other vertical plate; and a same investigation instrument (22) is placed on the tops of the first placement plate (20) and the second placement plate (21). Said lifting and lowering apparatus facilitates the disassembly of investigation instruments, and can adapt to investigation instruments of different sizes.
B: 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.
C: Disclosed is a solar powered refrigerator, comprising a refrigerator body, a top cover of the body, and refrigerator doors. The refrigerator body is provided with an extendable plate respectively on both sides, and the refrigerator doors and the extendable plates are provided with solar panels. When being used outdoors, the extendable plates on both sides can be pulled upwards into position via a rail, then rotated outwards 90 degrees such that the plates are parallel to the solar panels at the top and constitute therewith the largest light-absorbing area for power generation supplying sufficient power to the system. When not being used, the extendable plates on both sides can be rotated inwards 90 degrees and nestled closely to the body, and the solar panels can be hidden by being pulled downwards along the rail.
D: Disclosed is an intelligent control industrial robot, comprising a base (1), wherein a supporting arm (2) is fixedly installed at the top of the base, a sliding arm (5) is installed on one side of the supporting arm in a sliding manner, a welding gun (7) is movably installed on the sliding arm, a cylindrical rod (9) is fixedly installed at the bottom of the sliding arm, a placement table (15) is fixedly installed at the top of the base, two sliding grooves (12) are formed in the top of the base, sliding plates (13) are installed in the two sliding grooves in a sliding manner, the two sliding plates are located on the two sides of the placement table respectively, clamping blocks (14) are fixedly installed on the sides, close to each other, of the two sliding plates, a groove (16) is formed in the top of the placement table, and two clamping plates (17) are installed in the groove in a sliding manner. In the intelligent control industrial robot, a workpiece is clamped and fixed all around by means of the two clamping blocks and the two clamping plates, such that the welding stability of the workpiece is improved; moreover, different positions of the workpiece can be welded by adjusting the position of a welding gun; and the intelligent control industrial robot is simple in terms of structure, and is convenient to use.
Answer: C