Please select the most similar patent number from A, B, C and D. Which number is?
A frame for an aircraft (100), and an aircraft (100). The frame comprises: a body (10) and a fixing assembly (20). The fixing assembly (20) is provided on the body (10). The fixing assembly (20) comprises a fixing frame (210) and a fastening frame (220) spaced apart from each other in a first direction. The fixing frame (210) has two first assembly slots (2120) spaced apart from each other in a second direction. Each first assembly slot (2120) is suitable for accommodating a first arm (901). The fastening frame (220) comprises two second assembly slots (2220) spaced apart from each other in the second direction. Each second assembly slot (2220) is suitable for accommodating a second arm (902). The first direction is perpendicular to the second direction. The structure of the frame is simplified, thereby facilitating assembly and disassembly of an arm (90) of the aircraft (100).
A: Provided are a vehicle arm assembly of an unmanned aerial vehicle, and an unmanned aerial vehicle. The vehicle arm assembly (100) of the unmanned aerial vehicle comprises a first joint member (1), a second joint member (2) and a locking assembly (3), wherein an end portion of the first joint member (1) is hingedly connected to an end portion of the second joint member (2) by means of a spindle (4); the locking assembly (3) is capable of locking the first joint member (1) and the second joint member (2) at a predetermined position; the locking assembly (3) comprises a first locking structure (31), wherein same is provided on the first joint member (1) and is movable, and a second locking structure (32), wherein same is provided on the second joint member (2); and the first locking structure (31) and the second locking structure (32) are capable of being switched from a locked state to an unlocked state. The unmanned aerial vehicle comprising the vehicle arm assembly is capable of folding or unfolding the vehicle arm to adapt same to different occasions.
B: A cash storage apparatus (10) and cash recycling device (30), the cash storage apparatus (10) comprising a cabinet (100) and a cash cassette assembly (200). A first bill inlet and outlet (120) is provided on the top wall of the cabinet (100). Two guiding pieces (130) are arranged inside the cabinet (100), the two guiding pieces (130) being arranged at an interval in a first direction (300). Each guiding piece (130) comprises a guide rail (136), which extends in a second direction (310) perpendicular to the first direction (300) and is provided with a positioning part (137). A second bill inlet and outlet (222) is provided on the top of the cash cassette assembly (200). The cash cassette assembly (200) is provided with two first moving pieces (223). The two first moving pieces (223) are separately arranged to be movably matched with the two guide rails (136). When the two first moving pieces (223) have respectively been moved along the two guide rails (136) as to be matched with the positioning parts (137) on the two guide rails (136), the cash cassette assembly (200) is positioned inside the cabinet (100), and the second bill inlet and outlet (222) is opposite to and communicated with the first bill inlet and outlet (120).
C: The present application relates to a storage device for a wafer carrier. The storage device in the embodiments of the present application comprises: a support plate, comprising a first end portion, a main body portion and a second end portion that are consecutively arranged in a first direction; a spacer block, which is fixed on a lower side of the first end portion so as to make the support plate obliquely arranged as a whole, wherein the first end portion is higher than the second end portion; a stopper block, which is fixed on an upper side of the second end portion; two limiting plates, which are fixed on an upper side of the main body portion and spaced apart from each other in a second direction, the second direction being perpendicular to the first direction; and a plurality of transmission assemblies, which are arranged between the two limiting plates and arranged at intervals in the second direction, wherein each transmission assembly comprises a plurality of rollers distributed in the first direction, each roller is rotatably connected to the main body portion, and each roller at least partially protrudes out of an upper surface of the main body portion and is used to support a wafer carrier. The heights of the plurality of rollers in each transmission assembly gradually decrease in a direction approaching the second end portion.
D: A mask plate (1), comprising a frame (100) and first alignment bars (310). The frame (100) comprises two first frame edges (110) extending in a first direction and spaced apart in a second direction, and two second frame edges (120) extending in the second direction and spaced apart in the first direction; the first frame edges (110) and the second frame edges (120) intersect to form a quadrilateral; the first frame edges (110) and the second frame edges (120) comprise opposite first surfaces (102) and second surfaces (103); the first surfaces (102) of at least three corners (101) in four corners (101) of the quadrilateral are provided with the first alignment bars (310), each first alignment bar (310) is provided with a first alignment mark (311), and the first direction intersects with the second direction. The mask plate (1) prevents a solute (3) in a gap from being dried to solid powder to be dispersed in a display area, thereby improving the production yield of the device.
Answer: A