单项选择题
A.1/2~2/3 B.1/3~2/3 C.1/3~1/2 D.1/2~3/4
A.0.8m B.0.6m C.1.0m D.1.2m
A.2 B.2.5 C.3 D.4
A.4m B.5m C.6m D.6.25m
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