单项选择题
A.绿膏B.红膏C.黄膏D.白膏
A.0.3~0.4mmB.0.4~0.5mmC.0.5~0.6mmD.0.5~0.7mmE.0.6~0.7mm
A.2~4mmB.3~5mmC.5~8mmD.8~10mm