单项选择题
A.1/4张 B.1/3张 C.2/5张 D.1/2张 E.2/3张
A.1/2张 B.1/3张 C.2/3张 D.1/4张 E.等张
A.0.1% B.0.3% C.0.6% D.0.9% E.1.2%
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