单项选择题
A.1扣 B.1.5扣 C.2扣 D.3扣
A.1.5~8mm B.2~9mm C.3~9mm D.4~9mm
A.lmm B.1.5rnm C.2mm D.3mm
A.4~8mm B.4~12mm C.4~14mm D.4~16mm
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