单项选择题
A.1.5mm/m B.l.0mm/m C.0.5mm/m D.2.0mm/m
A.0.5mm B.1.5mm C.2.0mm D.3.5mm
A.1.5mm B.0.3mm C.0.6mm D.0.8mm
A.1~3.5mm B.1〜2.5mm C.3mm D.1~2.0mm
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