单项选择题
A.1% B.2% C.3% D.4%
A.0.2% B.0.5% C.0.8% D.1%
A.1% B.1.2% C.1.5% D.2%
A.1—2个月 B.2—3个月 C.3—4个月 D.3—6个月
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