单项选择题
A.0.3mB.0.5mC.0.6mD.0.8m
A.0.2m B.0.25m C.0.3m D.0.35m
A.0.3m B.0.5m C.0.6m D.0.8m
A.50% B.60% C.70% D.80%
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