单项选择题
A.0.1~0.3m B.0.3~0.5m C.0.5~0.7m D.0.7~1.0m
A.1m B.2~3m C.5m D.10m
A.8mB.10mC.12mD.15m
A.8-10 B.10-12.5 C.10-15 D.15-20
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