单项选择题
A.0.2-0.3% B.0.2-0.4% C.0.3-0.4% D.0.3-0.5%
A.2.5-3 B.3-3.5 C.3.5-4 D.4-4.5
A.1 B.2 C.3 D.4 E.5
A.2.0 B.2.5 C.3.0 D.4.0
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