单项选择题
A.1/2B.1/3C.1/4D.1/5
A.1/2 B.1/3 C.1/4 D.1/5
A.2;0.5 B.3;0.5 C.3;1 D.2;1
A.800 B.1000 C.1100 D.1200
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