单项选择题
A.0.6mmB.0.61mmC.0.607mmD.0.60mm
A.最大值,0.1mmB.最小值,0.01mmC.平均值,0.01mmD.平均值,0.1mm
A.2次,2~3mB.2次,3~5mC.3次,2~3mD.3次,3~5m