单项选择题

A.0.5%~1%(5.0~10.0g/L)
B.1%~2%(10.0~20.0g/L)
C.2%~3%(20.0~30.0g/L)
D.3%~5%(30.0~50.0g/L)
E.5%~6%(50.0~60.0g/L)