单项选择题
A.2%-3% B.8%-10% C.15%-20% D.30%-40%
A.100,3,20 B.100,6,60 C.200,3,40 D.200,6,40
A.0.2%-0.3% B.1%-2% C.2%-3% D.8%-10%
A.100 B.200 C.250 D.300
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