单项选择题
A.0.15-0.50 B.0.1-0.3 C.0.3-0.6 D.0.4-0.8
A.4 B.6 C.8 D.12
A.小于5% B.小于10% C.5-30% D.大于30%
A.800 B.1300 C.1600 D.2000
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