单项选择题
A.900mm B.1100mm C.1200mm D.1400mm
A.[0.5+(0.1~0.2)]m B.[0.55+(0.1~0.2)]m C.[0.5+(0~0.15)]m D.[0.55+(0~0.15)]m
A.150~200mm B.120~180mm C.140~175mm D.160~220mm
A.200~300mm B.250~320mm C.220~350mm D.300~450mm
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