Please select the most similar patent number from A, B, C and D. Which number is?
A decorative water cup comprises a housing (1), a pump device (2) provided in said housing (1), said pump device (2) comprising a pump housing (21), an electric motor (23) being arranged within said pump housing (21), and a vibration-damping layer (22) being arranged between the electric motor (23) and the inner surface of the pump housing (21). The vibration-damping layer (22) very effectively absorbs vibration occasioned when the electric motor (23) is in operation, allowing the electric motor (23) to operate with greater efficiency, and allowing the electric motor (23) to operate more quietly.
A: A decorative water cup, comprising a housing (1), said housing (1) comprising a cup body (11) and a base (12), the cup body (11) comprising an accommodation portion (111) and a transparent portion (112), and a cavity (121) being provided within the base (12). The accommodation portion (111) is arranged within the cavity (121); the transparent portion (112) is made of a transparent material and is configured as a plurality of prisms. Because the transparent portion (112) is configured as a plurality of prisms, light rays striking the cup body (11) are reflected a number of times, making the cup body (11) appear more crystalline and dazzling to the eye, thus significantly enhancing the aesthetic appeal of the decorative cup.
B: A decorative light, comprising a housing (1), a circuit board (11) being provided within the housing (1), an LED light (111) being provided on the circuit board. The housing (1) comprises a lower cover (12), a battery compartment (121) being provided on the lower cover (12). A battery (122), which is electrically connected to the circuit board (11), is provided within the battery compartment (121), and a battery fastening block (13) is provided on the battery compartment (121), a fastening block stopper (131) being provided on the battery fastening block (13). The battery fastening block (13) is fixedly connected to the lower cover (12), compressing, limiting and fixing the battery (122) by means of the fastening block stopper (131). The battery fastening block can fix the battery within the battery compartment, effectively preventing the battery from shaking (122), thereby ensuring the usage performance of the battery (122), and enabling the battery (122) to be used more safely and reliably.
C: A washing and draining integrated pump, comprising a power unit, a washer pump, a drainage pump, a washer pump water inlet chamber (42), and a drainage pump water inlet chamber (43). The power unit comprises a motor shell (1), a motor, and a motor shaft (10); the washer pump comprises a washer pump shell (2), a washer pump cavity (20), a washing impeller (12), and a washing water outlet (22); the drainage pump comprises a drainage pump shell (3), a drainage pump cavity (30), a drainage impeller (13), and a drainage water outlet (32); the washer pump water inlet chamber (42) is provided with a washing water inlet (21); the drainage pump water inlet chamber (43) is provided with a drainage water inlet (43); the motor shaft (10) passes through the washing impeller (12) and the drainage impeller (13) and can drive the washing impeller (12) and the drainage impeller (13) to rotate; a crushing blade (61) is mounted on the motor shaft (10) and used for first crushing food residues during draining. On the other hand, the washer pump water inlet chamber (42) and the drainage pump water inlet chamber (43) are combined to constitute an integrated water inlet chamber (4), and a filter means (63) is provided at the joint where the integrated water inlet chamber (4) is communicated with the washer pump cavity (20). A washing and draining integrated pump using this structure has less parts, occupies a small space, and is low in costs and high in the integration degree; during drainage, by first crushing residues and then discharging same, the user experience is improved.
D: An air-cooling air compressor having an improved structure, the air compressor comprising an electric motor and an air pump body. The electric motor comprises an electric motor housing (10), a stator (11) and a rotor (12), wherein the stator (11) is fixedly arranged in the electric motor housing (10), and the rotor (12) is rotatably arranged in the stator (11). The air pump body comprises an air pump housing (20), a crank (21), a connecting rod (22), a valve plate (23) and an air cylinder cover (24), wherein the crank (21) and the connecting rod (22) are arranged in the air pump housing (20); the air cylinder cover (24) is arranged above the air pump housing (20); the valve plate (23) is clamped between the air cylinder cover (24) and the air pump housing (20); the electric motor housing (10) is connected to the air pump housing (20); a rotating shaft (121) of the rotor (12) extends into the air pump housing (20) and is connected to the crank (21); a fan base (31) is further arranged above the air cylinder cover (24); and a fan (32) used for carrying out air-cooling heat dissipation on the air cylinder cover (24) is arranged in the fan base (31).
Answer: A