单项选择题
A.2%~5% B.3%~10% C.5%~10% D.10%~15%
A.900~1000 B.1000~1100 C.1100~1200 D.1200~1300
A.0.1 B.0.2 C.0.25 D.0.3
A.1.6 B.2 C.2.3 D.2.75
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