单项选择题
A.4%～6% B.5%～7% C.6%～8% D.7%～9%
A.70～80 B.75～85 C.80～90 D.80～95
A.1/2 B.1/3 C.1/4 D.1/5
A.0.6 B.0.7 C.0.8 D.0.9
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