单项选择题
A.0.667 B.0.85 C.1.20 D.0.56
A.6 B.0.044 C.4.4 D.0.049
A.1.539 B.0.04 C.1.164 D.0.08
A.0.20 B.3.33 C.0.267 D.2.667
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