Please select the most similar patent number from A, B, C and D. Which number is?
A spotlight structure of the present invention, comprising a main body, a waterproof front cover, and a waterproof rear cover; the main body is provided with a front cavity and a rear cavity, and a focusing assembly, a light adjustment assembly and a color temperature adjustment assembly are provided in the cavities; threads are provided on outer walls of the front and rear ends of the main body, dovetail grooves are provided at the roots of the threads, and O-shaped rings are sleeved on the dovetail grooves; and inclined edges are provided on the edges of the waterproof front cover and the waterproof rear cover close to the O-shaped rings, the waterproof front cover is in threaded connection with the front end of the main body, and the waterproof rear cover is in threaded connection with the rear end of the main body. The object of the present invention is to provide a spotlight structure which is waterproof and integrates light brightness adjustment, color adjustment and light spot adjustment.
A: Disclosed is an intelligent anti-theft device, comprising an upper cover (1), a micro central processing unit (10), a hollow tube (2), a battery (20), a screw (3) and an expansion nut (4), wherein the upper cover (1) is provided with an inner cavity; the micro central processing unit (10) is arranged inside the inner cavity of the upper cover (1); the upper cover (1) is in threaded connection with one end of the hollow tube (2); the battery (20) is arranged inside the hollow tube (2); the micro central processing unit (10) is electrically connected to the battery (20); the other end of the hollow tube (2) is provided with an inner thread, through which the hollow tube (2) is in threaded connection with one end of the screw (3); and the other end of the screw (3) is in threaded connection with the expansion nut (4). The intelligent anti-theft device is an intelligent anti-theft product. The purpose thereof is to provide an intelligent anti-theft device having a lightweight structure, being easy to use, capable of being conveniently locked, having a high compatibility for convenient assembly to a bicycle or an electric vehicle, being dust-proof and water-proof, and enabling the bicycle or the electric vehicle assembled with the anti-theft device to have an anti-theft function.
B: The present utility model relates to an air brush head structure, comprising an air brush handle body and a spray head, wherein a spray needle is provided in the air brush handle body; a nozzle is provided in the spray head; a nozzle base is clamped in the air brush handle body; an air channel is provided between the air brush handle body and the nozzle base; the rear end of the spray nozzle is connected in the nozzle base in a threaded manner; the outer wall of the middle of the nozzle matches the inner wall of the front end of the nozzle base via a conical surface; the inner wall of the rear end of the spray head is connected to the outer wall of the front end of the air brush handle body in a threaded manner; the front end of the nozzle penetrates the spray head and partially extends out of the nozzle; the inner wall of the spray head abuts against the outer wall of the nozzle; and the front end of the nozzle is connected to a nozzle cap in a threaded manner. The whole structure is convenient to assemble and disassemble, is convenient to clean and replace later on, and the concentricity of the nozzle and the handle body can be ensured, so as to achieve uniform and fine spraying.
C: A lamp holder structure for a waterproof stage lamp, comprising a lamp body support (1), a front head cover (2) and a rear head cover (2) respectively disposed on the front side and the rear side of the lamp body support (1), a lens assembly (4) disposed above the lamp body support (1), a heat dissipation assembly (3) disposed below the lamp body support (1), a light source (5) disposed in a cavity of the lamp body support (1), and a plurality of optical components (6) arranged in the direction of a primary optical axis. The optical components (6) are connected and fixed to the inner wall of the lamp body support (1). The lens assembly (4), the lamp body support (1), and the heat dissipation assembly (3) are all disposed in a cavity formed by joining the front head cover (2) and the rear head cover (2) together. The front head cover (2), the rear head cover (2), the lens assembly (4), and the heat dissipation assembly (3) are sealedly connected to the lamp body support (1) along the edges to form an all-around waterproof structure. The lamp holder structure has a good waterproof effect, is convenient to mount and demount, and is beneficial to subsequent maintenance.
D: An inflatable sprayer. The sprayer comprises: a bottle body (1), which is a main body used for filling with liquid, inflating with gas and for spraying, wherein the upper end of the bottle body (1) is provided with a liquid filling port (2), and the lower end of the bottle body (1) is provided with an inflation cavity (3) in an integrally recessed inward manner; a waterproof ventilation device (4), which is arranged at a position where the upper end of the inflation cavity (3) is in communication with the interior of the bottle body (1); a sealing cover (5), which is in rotary retaining threaded-connection with the liquid filling port (2) of the bottle body (1) and is used for filling with the liquid and installing a spraying pump assembly (7) in a sealing manner; a mounting cavity (6), which is provided on the sealing cover (5) in an integrally upward-protruding manner; the spraying pump assembly (7), which is a main part for realizing liquid feeding and spraying, wherein the spraying pump assembly (7) is arranged in the mounting cavity (6) and penetrates upward through the top of the mounting cavity (6) and extends to the outside of the bottle body (1); and an inflation pump assembly (8), which is an assembly arranged in the inflation cavity (3) and is used for inflating the interior of the bottle body (1) with compressed gas. In the inflatable sprayer, the design of the liquid filling port (2) being arranged at the upper part and the inflatable structure being arranged at the lower part is realized, and the waterproof ventilation device (4) is used, such that the inflatable sprayer has a good sealing performance, is safe and reliable, and can be reused.
Answer: C