单项选择题
A.2m B.4m C.6m D.8m
A.0.2-0.5m B.0.3-0.7m C.0.5-0.8m D.0.3-0.6m
A.25mm B.30mm C.35mm D.40mm
A.1~2 B.2 C.2~3 D.3
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