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