单项选择题
A.1/3 B.1/4 C.1/5 D.1/6
A.0.5,0.7 B.0.7,0.5 C.0.6,0.7 D.0.6,0.5
A.4 B.5 C.8 D.10
A.80 B.100 C.110 D.150
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