Please select the most similar patent number from A, B, C and D. Which number is?
A screwdriver, comprising a screwdriver head, the screwdriver head (1) being divided into a first screwdriver head part (11) and a second screwdriver head part (12), and the first screwdriver head part (11) and the second screwdriver head part (12) overlapping to form a complete screwdriver head (1); and a tension mechanism (2), which is used for generating tension so as to drive a screw when the screwdriver head (1) is in contact with a screw recess after the first screwdriver head part (11) and the second screwdriver head part (12) overlap. A screw (7), comprising a cross-shaped recess (71), a side surface of the cross-shaped recess (71) being triangular or quadrilateral. Therefore, after the first screwdriver head part (11) and the second screwdriver head part (12) are combined and inserted into the screw (7), the first screwdriver head part (11) and the second screwdriver head part (12) can be separated by means of the tension mechanism (2). In addition, the tension mechanism (2) provides tension to clamp the screw (7), and therefore, screws made of different materials can be clamped by means of the screwdriver, thereby improving the screw fastening efficiency, and avoiding the processes of magnetizing the screwdriver and so on.
A: Disclosed is a magazine-type hand-held shaver (100), comprising a shaver head (10), a magazine body (20), a shaver head connection cover (30) and an elastic element (40). The shaver head comprises a first shaver head (10a) and a second shaver head (10b) which are interchangeable. The magazine body is of a hollow structure which forms an accommodation chamber (21) with a removal port (22) located at the upper end of the magazine body, and the shaver head is accommodated inside the accommodation chamber. The lower end of the shaver head connection cover is removably assembled on the magazine body and covers the removal port, and a connection part (31) is provided on the upper end of the shaver head connection cover, and is selectively assembled with the first shaver head or the second shaver head. The elastic element is accommodated inside the accommodation chamber, and tends to constantly drive the shaver head to slide to be opposite to the removal port. The shaver head can be easily stored in or taken out of the magazine body, and the magazine-type hand-held shaver is thus convenient to be carried about and used by a user when going out.
B: An ultrasonic osteotome cutter bit, comprising a cutter bit head (1), a cutter bar (2), and a cutter body (3); one end of the cutter bar (2) is connected to the cutter bit head (1), and the other end of the cutter bar (2) is connected to the cutter body (3); the cutter bit head (1) has a shape of flat sheet; the top end (11) of the cutter bit head (1) is configured to be arc-shaped; one of side surfaces of the cutter bit head (1) is provided with a toothed structure (12); the top end (11) of the cutter bit head (1) is provided with a thickened portion which is increased in thickness compared with other parts of the cutter bit head (1). The ultrasonic osteotome cutter bit can converge energy produced by an ultrasonic transducer at a front part of the cutter so that the front part of the cutter has the strongest energy output to achieve the strongest working efficiency. The top end (11) of the cutter bit head (1) adopts an arc-shaped structure, so as to effectively avoid the top end from scratching tissues, thereby improving surgical safety.
C: A multifunctional screwdriver comprises a handle (1) and a matching shaft (2), the matching shaft (2) being fixed to one end of the handle (1), wherein an end, which is away from the handle (1), of the matching shaft (2) is provided with two screwdriver bit holes, comprising a first screwdriver bit hole (21) and a second screwdriver bit hole (22); and the second screwdriver bit hole (22) is provided at the bottom of the first screwdriver bit hole (21). In the screwdriver, two screwdriver bit holes are provided on an end portion of the matching shaft, the bottom of one screwdriver bit hole is provided with the other screwdriver bit hole, thereby meeting the use of screwdriver bits with different thicknesses and different lengths, so that the matching shaft can be used in coordination with two types of screwdriver bits, thus increasing the use efficiency of the screwdriver.
D: Disclosed is a cartridge type shaver (100), comprising a shaver head (10), a cartridge body (20) of a hollow structure for a hand to hold when shaving the face, and an elastic element (30). The shaver head comprises a first shaver head (10a) and a second shaver head (10b) replaceable with each other. The hollow structure forms an accommodation cavity (21) with an access port (231). The cartridge body is provided with a connection part (22). The shaver head is accommodated in the accommodation cavity. The connection part is selectively assembled and connected with the first shaver head or the second shaver head. The elastic element is accommodated in the accommodation cavity, and the elastic element has the tendency of constantly driving the shaver head to slide to the access port. Since the cartridge type shaver accommodates the shaver head in the cartridge body, and the shaver head accommodated in the cartridge body is pushed out by the elastic element, the shaver head can be conveniently stored in and taken out from the cartridge body, so as to facilitate being carried about and used by a user.
Answer: C