单项选择题
A.2% B.4% C.8% D.12%
A.2%~4% B.4%~8% C.8%~12% D.12%以上
A.2%~4% B.4%~6% C.6%~8% D.8%~12%
A.1天 B.3天 C.5天 D.10天
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