单项选择题
A.0.6mB.0.9mC.1.2mD.1.5m
A.5m B.10m C.15m D.20m
A.1.5mB.2.0mC.2.5mD.3.0m
A.100~250mm B.150~300mm C.200~350mm D.250~400mm
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