单项选择题
A.1.2m B.2.5m C.1.5m D.6.0m
A.5% B.6% C.7% D.8%
A.0.3 B.0.5 C.0.8 D.1.2
A.1.0~1.5 B.1.5~1.8 C.2.0~2.5 D.2.0~3.0
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