单项选择题
A.3km/h B.5km/h C.8km/h D.10km/h
A.2～5mm B.1～4mm C.2～4mm D.3～5mm
A.0.5mm B.1.0mm C.1.5mm D.2.0mm
A.5mm B.6mm C.7mm D.8mm
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