单项选择题
A.1/2B.2/3C.1/4D.1/3
A.0.90m B.0.60m C.1.00m D.0.45m
A.1/2B.1/3C.2/3D.1/4
A.2.20m B.2.0m C.2.10m D.1.20m
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