单项选择题
A.0.003~0.006mmB.0.005~0.015mmC.0.006~0.020mmD.0.009~0.025mm
A.1级B.2级C.3级D.4级
A.0.02~0.04mmB.0.03~0.06mmC.0.04~0.08mmD.0.06~0.09mm