单项选择题
A.1.4,0.6 B.1.8,0.35 C.1.5,.0.6 D.1.4,0.5
A.1 B.2 C.3 D.4
A.0.5 B.1 C.0.75 D.1.5
A.1.5 B.1 C.0.24 D.0.5
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