Please select the most similar patent number from A, B, C and D. Which number is?
Provided is a toothbrush, which comprises a brush handle (10) and a brush head (20). The brush handle (10) comprises a grab handle (11) and a connecting shaft (12) connected to one end of the grab handle (11). The brush head (20) is provided with a connecting cavity (21); the connecting shaft (12) is used for being inserted into the connecting cavity (21) and the connecting shaft (12) is used for being connected to the brush head (20) in a clamped manner. The connecting shaft (12) is provided with a clamping groove (121); the brush head (20) is provided with an elastic clamping member (22) arranged on the cavity wall of the connecting cavity (21); the elastic clamping member (22) can match the clamping groove (121) in a clamped manner; or the clamping groove (121) is arranged in the cavity wall of the connecting cavity (21), the connecting shaft (12) is provided with the elastic clamping member (22), and the elastic clamping member (22) can match the clamping groove (121) in a clamped manner.
A: A bottle cap capable of being opened by one press, comprising a bottle mouth (11) and a bottle cap (1), and further comprising a positioning ring (3), a fixing ring (10), and an oval elastic snap ring (8). A slot (13) is provided between the positioning ring (3) and the fixing ring (10); the two major axis ends of the elastic snap ring (8) are located in the slot (13); either of the two major axis ends of the elastic snap ring (8) is provided with a press piece (7); a groove (12) is circumferentially formed on the side wall of the bottle mouth (11) at a position corresponding to the elastic snap ring (8); the two minor axis ends of the elastic snap ring (8) are located in the groove (12) to lock the connection of the bottle cap (1) to the bottle mouth (11), and are configured to stretch as the press piece (7) is pressed, so as to disengage from the groove (12) and enter the slot (13), thereby unlocking the connection of the bottle cap (1) to the bottle mouth (11).
B: Disclosed are a connector applied on a ring and a ring of a combined structure, relating to the field of jewellery. The ring of a combined structure comprises a finger ring, a decorative part and a connector, wherein the connector comprises a clamping seat (1) used for fixedly connecting the finger ring and a clamping head (2) used for fixedly connecting the decorative part; the clamping seat (1) and the clamping head (2) are cooperatively clamped; the clamping head (2) comprises a cylindrical main body (21), and a clamping block (22) is provided on the cylindrical main body; and the clamping seat (1) comprises a housing (11) and an elastic clamping ring (12) provided in the housing (11). The clamping head (2) is inserted into a notch (112) via the clamping block (22) and contacts a positioning groove (123) on the elastic clamping ring (12). The clamping head (2) is rotated, and the clamping block (22) drives the positioning groove (123) and thus drives the elastic clamping ring (12) to rotate. An elastic clamping member (122) is gradually compressed in the rotation process, when rotating to a certain position, an elastic force generated after the elastic clamping member (122) is compressed firmly fastens and fixes the elastic clamping ring (12) in the housing (11) so that the clamping head (2) is fixed on the housing (11) and can be detached when rotating in the opposite direction. Different decorative parts can be exchanged and mounted on the clamping head (2) so as to realize free collocation and combination between the ring and the different decorative parts.
C: Disclosed are a joining structure and a shaving device comprising the joining structure. The joining structure of the shaving device comprises a first joining component (10) and a second joining component (20), wherein the first joining component (10) is provided with a connection shaft (11), and the second joining component (20) is provided with a connection cavity (21); the shape of the connection shaft (11) matches the shape of the connection cavity (21), and can be connected to or separated from the connection cavity; at least two protruding buckles (30) extending in a protruded manner in a radial direction are provided on the connection shaft (11), and elastic sheet buckles (40) corresponding to the positions of the protruding buckles (30) are provided in the connection cavity (21); and when the connection shaft (11) is inserted into the connection cavity (21), each of the protruding buckles (30) forces the corresponding elastic sheet buckle (40) to deform until same is fastened with the elastic sheet buckle (40). The elastic sheet buckles (40) can maintain the required elastic force, and then can guarantee that the first joining component (10) and the second joining component (20) always maintain a stable connection state.
D: A replaceable brush head (10) and a toothbrush with the replaceable brush head (10) , wherein the replaceable brush head (10) comprises a bristle seat (11, 11A, 11B), multiple bristles (12) and at least one brush head fixing member (13, 13A), the bristles (12) are arranged on the front side of the bristle seat (11, 11A, 11B), the brush head fixing members (13, 13A) are arranged on the bristle seat (11, 11A, 11B), and can be detachably combined with a brush handle (20) of the toothbrush, the toothbrush with the replaceable brush head (10) comprises the replaceable brush head (10) and the brush handle (20), the brush handle (20) is detachably connected to the replaceable brush head (10) through a handle connecting portion (22), with the replaceable brush head (10), when the bristles (12) on the replaceable brush head (10) gradually lose their cleaning ability due to long-term use, a user can detach the replaceable brush head (10) from the brush handle (20) and replace a new replaceable brush head (10) to achieve the purpose of continuously using the same brush handle (20), thereby saving the user&#39;s purchase cost.
Answer: D