单项选择题

A.常用0.125%~0.15%,一般不超过0.25%
B.常用0.25%~0.375%,一般不超过0.5%
C.常用0.25%~0.5%,一般不超过0.75%
D.常用0.0625%~0.1%,一般不超过0.125%
E.常用0.5%~0.75%,一般不超过1%