单项选择题
A.0.5~2mm B.1~2mm C.1~2.5mm D.1~3mm
A.2mm B.2.5mm C.3mm D.3.5mm
A.1.0mm B.1.5mm C.2.0mm D.2.5mm
A.1.5mm B.2mm C.2.5mm D.3mm
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