单项选择题
A.70% B.75% C.80% D.85%
A.20针；16针 B.18针；16针 C.20针；18针 D.16针；14针
A.10% B.15% C.20% D.25%
A.5%；10% B.10%；5% C.10%；20% D.20%；10%
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