单项选择题
A.2m~4m B.1m~3m C.1m~2m D.2m~3m
A.1.5mm B.2.0mm C.0.5mm D.2.5mm
A.15mm B.10mm C.16mm D.20mm
A.0.5mm B.0.3mm C.0.1mm D.2.0mm
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