Please select the most similar patent number from A, B, C and D. Which number is?
A fan, comprising a housing and a water tank provided with a through-hole (21) and used for storing a liquid, further comprising a closure cap (3) used for closing said through-hole (21). The fan is provided with the closure cap (3) used for closing the through-hole (21) on the tank opening, thereby preventing the liquid in the water tank from leaking out of the through-hole.
A: A decorative lamp, comprising a housing (1), a circuit board (2) fixed inside the housing and provided with a lamp (21), a bottle (3) fixed inside the top of the housing and internally provided with liquid, a stopper (4) used for closing the mouth of the bottle, and a lid (5) encasing the stopper. The decorative lamp comprises a housing, a circuit board fixed inside the housing and provided with a lamp, a bottle fixed inside the top of the housing and internally provided with liquid, a stopper used for closing the mouth of the bottle, and a lid encasing the stopper; the cap is sleeved on the stopper, preventing damage to the stopper and ensuring a tight fit between the mouth of the bottle and the stopper, thus preventing the stopper from becoming loose and leaking liquid.
B: A decorative lamp, comprising a housing (1), a bottle (5) fixed on the housing (1), a base (3) provided with an opening at its bottom and fixed at the bottom of the housing (1), a circuit board (2) fixed inside the housing (1), and a closure cap (4) closing the opening. The closure cap closes the opening of the base, thus preventing dust or debris from entering into the housing from the opening of the base and also preventing the components inside the housing from damage due to dust or debris.
C: An electronic fishbowl comprising a bowl body (1), model fishes (7) placed within the bowl body (1), a circuit board (5), and an actuating motor (2) connected to the circuit board (5) via a lead. The bowl body (1) comprises a water tank (12) provided with an opening and a lid (11) used for closing the opening. A propeller is arranged on an output shaft of the actuating motor (2). The electronic fishbowl also comprises a motor housing (3) sleeved on the actuating motor (2). The motor housing (3) is provided with a water passage at where the propeller (21) is located. The motor housing (3) is sleeved on the actuating motor (2), the water passage is provided on the motor housing (3), water enters the motor housing (3) from a water inlet (311) of the water passage, and the propeller (21) on the output shaft of the actuating motor (2) rotates continuously to output via a water outlet the water that entered the motor housing (3), thus preventing the water from entering the actuating motor (2) and affecting normal operation of the actuation motor.
D: The present invention discloses a fan, comprising a housing, a water spray device mounted inside said housing and used for spraying mist; the nozzle of said water spray device is provided with two opposing projections, and said housing is provided with retaining slots for placement of said projections. In the present invention, the two retaining slots are arranged on the housing and are used for retaining and fixing the projections; thus the sides of the projections are placed in the retaining slot, and when the projections are pressed, the projections move along the retaining slots so as not to cause pressure on other parts of the water spray device, thus protecting the water spray device and making it less prone to damage.
Answer: D