单项选择题
A.60% B.40% C.30% D.70%
A.6%~8% B.10%~12% C.4%~6% D.12%~15%
A.80%~85% B.75%~80% C.65%~70% D.70%~75%
A.25%~30% B.15%~20% C.20%~25% D.30%~25%
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