单项选择题
A.50 B.100 C.150 D.200
A.5%~10% B.10%~20% C.20%~30% D.40%~50%
A.1 B.2 C.2.5 D.3
A.0.5%~1% B.1%~1.5% C.1%~2% D.1.5%~2%
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