单项选择题
A.1/3 B.1/2 C.2/3 D.1/4
A.0.04;0.03 B.0.08;0.06 C.0.10;0.06 D.0.10;0.08
A.30% B.50% C.90% D.400%
A.42 B.36 C.24 D.12
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