A.游标卡尺:精度0.02mmB.抗折试验机:精度I 级C.钢卷尺:精度1mmD.钢直尺:精度0.5mm
A.20mmB.25mmC.50mmD.100mm
A.宽度1mm,厚度0.5mmB.宽度0.5mm,厚度0.5mmC.宽度1mm,厚度0.1mmD.宽度0.5mm,厚度0.1mm