单项选择题
A.0.1mm B.0.2mm C.0.5mm D.1mm
A.0.15mm/m B.0.2mm/m C.0.25mm/m D.0.3mm/m
A.0.1mm B.0.2mm C.0.3mm D.0.5mm
A.1 B.2 C.3 D.4
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