单项选择题
A.1720B.1620C.1520D.1420
A.40%B.50%C.60%D.70%
A.0.1%B.0.2%C.0.3%D.0.4%
A.0.5%~1.0%B.1.0%~1.5%C.1.5%~2.0%D.2.0%~2.5%
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