单项选择题
A.4 B.8 C.12 D.16
A.2 B.1.5 C.1 D.0.5
A.1/2;1/3 B.1/3;2/3 C.2/3;2/3 D.1/4;1/3
A.0.8 B.0.6 C.0.4 D.0.2
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