单项选择题
A.0.25mmB.0.50mmC.0.75mmD.0.10mm
A.0.010~0.020mmB.0.020~0.035mmC.0.035~0.060mmD.0.060~0.090mm
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
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