单项选择题
A.0.5%-1.0%B.1.5%-1.8%C.2.0%-2.5%D.2.5%-3.0%
A.1350-1450B.1450-1550C.1550-1600D.1600-1650
A.0.2%~0.3%B.0.3%~0.4%C.0.4%~0.5%D.0.5%~0.6%
A.0.02%B.0.03%C.0.04%D.0.05%
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