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1. A quick-assembly structure for a chassis and a seat cushion of a chair, the quick-assembly structure comprising first inserting connection structures, wherein each of the first inserting connection structures comprises an inserting and clamping member and a groove body adapted to be in inserting fit with the inserting and clamping member, one of the inserting and clamping member and the groove body is provided on the chassis, and the other one is provided on the seat cushion; each of the groove bodies comprises an inserting groove and a clamping groove which are in communication with each other, the corresponding inserting and clamping member is inserted into the inserting groove in a vertical direction and then horizontally slides into the clamping groove in a first direction, and when the inserting and clamping member is located in the clamping groove, the seat cushion and the chassis are kept positioned relative to each other in the vertical direction; and the seat cushion is further provided with elastic buckles, the chassis comprises a clamping connection surface, and when the inserting and clamping members slide to predetermined positions in the clamping grooves, the elastic buckles are clamped with the clamping connection surface of the chassis in an abutting manner so as to restrict the chassis from sliding relative to the seat cushion in a direction opposite to the first direction.
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