Please select the most similar patent number from A, B, C and D. Which number is?
A health-promoting pillow comprises a supine position portion (1) and two side position portions (2) respectively arranged at two opposite sides of the supine position portion (1). The supine position portion (1) comprises a protruding support stage (10) protruding front ends of the two side position portions (2). A first cushioning recess (11) is located at the periphery of the protruding support stage (10). The design improves quality of sleep of a user.
A: Disclosed is an LED stand with a vertical vibration reducing function, comprising a main stand (7) provided on either side thereof with a boss (6), wherein the boss (6) is provided with a pin hole (2), the upper end of a side plate (5) is provided with a pin hole (2), and the main stand (7) is provided with two pin holes (2); the lower surface of the head of a pin (1) is welded onto the upper surface of the boss (6); the lower end of the main stand (7) is provided with two grooves (9), and the side plate (5) is arranged in the grooves (9); the main stand (7) is connected with the side plate (5) by the pin (1); an upper side spring (3) is arranged on an upper surface of the side plate (5), and a lower side spring (4) is arranged on a lower surface of the side plate (5); and the upper end of the main stand (7) is provided with three first mounting holes (8), and the lower end of the main stand (7) is provided with two second mounting holes (10). The stand has a simple manufacturing process and a low manufacturing cost, and can provide a buffer for LED lamps and prolong the service life of ceiling lamps.
B: A front-back moving-type precise four-column discharging machine, comprising a rack (1). Connecting blocks (4) are provided on the left and right sides of the rack by means of two guide columns (2) and a punching oil cylinder (3). The two connecting blocks are respectively provided with punching pressure plate moving guide rails (5). A punching pressure plate (6) is slidably provided between the two connecting blocks by means of the punching pressure plate moving guide rails. Support bosses (61) are respectively provided on two sides of the punching pressure plate. The two sides of the punching pressure plate are supported on the punching pressure plate moving guide rails by means of the support bosses. The edges of the two support bosses are respectively positioned on the axes of the two guide columns. The two connecting blocks are respectively provided with support planes (41) matching the support bosses. Oil storage tanks (7) matching the punching oil cylinder are respectively provided on two sides of the rack.
C: Disclosed is an anti-displacement fastener for the correction of an ingrown nail, the fastener comprising a fixing elastic piece (1) and a clamping elastic piece (2), wherein the clamping elastic piece (2) is clamped in the fixing elastic piece (1), and after the fixing elastic piece (1) and the clamping elastic piece (2) are assembled, one end of each that is away from the other is provided with an arc-shaped inwardly fastened correction hook (10); a supporting protrusion (3) is provided above an outer side of the fixing elastic piece (1), with the distance between an end face of the supporting protrusion (3) that is away from the fixing elastic piece (1), and the outer side of the fixing elastic piece (1) being greater than the thickness of the clamping elastic piece (2), a fastening elastic piece (4) is hinged to a hinge position (5) of the supporting protrusion (3), and the other end of the fastening elastic piece (4) is provided with a fastening interface that concaves inwardly toward the fastening elastic piece (4); and a terminal end of the fixing elastic piece (1) is further provided with an L-shaped clamping interface (8) perpendicular to the fixing elastic piece (1), and clamping protrusions (9) matching the L-shaped clamping interface (8) are distributed at an upper end of the clamping elastic piece (2) at equal intervals. The fastener for the correction of an ingrown nail has the beneficial effects of being small in size, lightweight, and being easy to mount and remove. Moreover, the fastener achieves multi-prevention of displacement, is stable for being worn and will not easily fall out, and is convenient for practical use. In addition, the manufacturing cost is low, and the structure is simple and easy to produce and manufacture.
D: A desktop pillow, the desktop pillow comprising: a pillow body (1) which is a U-shaped air bag structure having a concave portion (11) that opens upward, the concave portion (11) penetrating the pillow body (1) in a front-rear direction; a height adjusting air bag (2), fixed at a lower portion of the pillow body (1), the height adjusting air bag (2) being a retractable pipe organ-like air bag and being capable of expanding or shrinking in a vertical direction; and a chest air cushion (3) which is an air bag structure fixed at a rear side edge of the bottom of the height adjusting air bag (2). Said desktop pillow may support the weight of a head, reduce pressure on the cervical vertebra of a user and adapt to the heights of different users, so that the users may obtain more comfortable sleeping postures. In addition, space for users to naturally place both arms and hands thereof during desktop sleep is provided, which avoids the occurrence of arm numbness caused by pressing on both arms during sleep. The pillow may also provide soft support for the chest, and the whole desktop pillow may be fixed, thereby improving the sleep quality of users.
Answer: D