单项选择题
A.0.1%~0.2%B.0.2%~0.3%C.0.3%~0.4%D.0.4%~0.5%
A.2B.2.5C.3~5D.6
A.0.01~0.02B.0.002-0.003C.0.03-0.04D.0.04~0.05