单项选择题
A.250mm B.300mm C.350mm D.500mm
A.6m B.10m C.12m D.15m
A.1/10~1/3 B.1/10~1/5 C.1/8~1/3 D.1/8~1/5
A.0.6m B.0.8m C.1.0m D.1.2m
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