单项选择题
A.0.6 B.0.8 C.1 D.1.2
A.10 B.20 C.40 D.50
A.3m,4m B.3m,5m C.6m,8m D.6m,10m
A.0.6m,3m B.1m,3m C.1.6m,3m D.0.6m,6m
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