单项选择题
A.不小于2mm B.4~15mm C.3~7mm D.4~6mm
A.不小于2mm B.3~7mm C.4~15mm D.4~6mm
A.不小于2mm B.4~6mm C.3~7mm D.4~15mm
A.4~6mm B.4~15mm C.不小于2mm D.3~7mm
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