Please select the most similar patent number from A, B, C and D. Which number is?
A hidden pacifier, relating to the field of maternal and baby devices, comprising a curved stop plate, a simulated nipple, a protective housing, and a limit ring. One side of the curved stop plate is disposed on the protective housing; the limit ring is provided in the protective housing; one side of the simulated nipple is connected to the protective housing; a stop plate air hole is provided on the curved stop plate, so as to prevent a baby from being unable to breathe due to swallowing by mistake; the side of the simulated nipple is connected to the protective housing by means of a nipple extension ring; the limit ring is annular and is mounted on the protective housing. The beneficial effects of the utility model are that: the limit ring on the device can maintain the nipple protruding state during use of the device without the need for a user to hold the position of the nipple for a long time, so that a baby can perform sucking better, thereby reducing the workload of the user and making the baby more confortable.
A: A medical trolley, comprising a medical trolley housing (1). A partition is horizontally arranged in the medical trolley housing (1); the sidewall of the partition is perpendicularly and fixedly connected to the middle of the inner wall of the medical trolley housing (1); the upper and lower sides of the partition are each arranged with a storage box (2); two sides of the storage box (2) are movably connected to the inner wall of the medical trolley housing (1); wheels (8) are fixedly arranged on the lower side of the medical trolley housing (1); two sidewalls of the medical trolley are each arranged with a vertical groove; a support rod (9) is arranged in the vertical groove; two sides of the upper end of the support rod (9) are movably connected to the sidewall of the vertical groove by means of pins; a detachable recycling box (14) is arranged on an underframe of the medical trolley housing (1). According to the medical trolley, by means of the arrangement of a sliding block limiting groove (4) and a sliding groove (5), the storage box (2) can be drawn out from two sides, so that an article can be conveniently placed and taken; the recycling box (14) facilitates sorting, recycling, and disposal of waste and reduces unnecessary workload in a later stage; by means of the arrangement of the support rod (9), a U-shaped baffle (10), and a U-shaped elastic block (11), the medical trolley is not prone to fall; the storage box (2) is coated with a rust-proof layer, so as to prolong the service life thereof.
B: Disclosed is a hearing aid nipple, comprising a nipple frame (21), a hollow nipple (22) provided on one side of the nipple frame (21) and a container (23) provided on the other side of the nipple frame (21), with a vibration tongue (25) being arranged in the hollow part of the nipple (22), and the tail end of the vibration tongue (25) being fixed to the nipple frame (21), wherein a microphone (31) for receiving environmental sounds is arranged on the wall of the container (23), and in the container (23) are provided a circuit board (32) electrically connected with the microphone (31) and a vibration sensor (24) electrically connected with the circuit board (32) and used for converting the environmental sounds into a vibration wave. A hook (27) is also arranged on the wall of the container (23) and is in contact with the vibration sensor (24) to transfer the vibration waves. One end of the hook (27) that protrudes from the container (23) is detachably connected with one end of the vibration tongue (25) that protrudes from the nipple frame (21). Using the solution of the present invention enables infants with underdeveloped ear canals to hear environmental sounds, and the vibration tongue does not need to be disassembled during cleaning.
C: Disclosed is a modified starch processing apparatus having a recovery function, the apparatus comprising a protective housing. A rolling wheel is fixedly mounted on both the front and the rear sides of the bottom end of the protective housing; a discharge port is fixedly mounted on the outer side of the bottom end of the protective housing; a control panel is fixedly mounted on a front end surface of the protective housing; and a top protective lid is movably mounted at a middle section of the top end of the protective housing. In the modified starch processing apparatus having a recovery function, the rolling wheels can assist the apparatus in movement, thereby expanding the usage range of the apparatus; the discharge port can assist in discharging stored starch, thereby increasing the practicability of the apparatus itself; and the control panel can assist the apparatus in carrying out control, thereby facilitating the operation of the apparatus. In addition, a suction pump can suck in drifting starch by means of a suction force thereof, which is beneficial for improving the recovery efficiency of starch; and a recessed groove can ensure that a transmission rod flexibly rotates therein, thus helping to expand the suction range of a suction fan.
D: Disclosed is a vehicle-mounted camera device for intelligent automatic driving, comprising a protective housing. The interior of the protective housing is symmetrically provided with four hydraulic oil pipes; the interior of the protective housing is symmetrically provided with four connecting blocks located on inner sides of the four hydraulic oil pipes; the interior of the protective housing is provided with camera apparatuses located on inner sides of the four connecting blocks; and the interior of the protective housing is symmetrically provided with four connecting rods located between the connecting blocks and the camera apparatuses. The vehicle-mounted camera device for intelligent automatic driving in the present invention relates to the field of automatic driving. By providing a damping spring on one end of each connecting block, vibration of the camera apparatuses can be reduced; by providing the hydraulic oil pipes and telescopic columns, the amplitude of the damping springs can be reduced; and by providing the connecting rods, the connection between the connecting blocks and the camera apparatuses is facilitated, and thus the movement of the camera apparatuses is facilitated, and the risk of damage of the vehicle-mounted camera device for intelligent automatic driving caused by vibration is finally reduced.
Answer: B