单项选择题
A.48B.24C.12D.8
A.4B.3C.2D.1
A.3/4B.2/3C.1/2D.1/3
A.5小时B.4小时C.3小时D.2小时
A.80%B.100%C.75%D.50%
A.直径B.螺距C.半径D.长度
A.1〜5B.1.5〜3C.1.5〜5D.1〜3
A.15mmB.20mmC.5mmD.10mm
A.+30mmB.±20mmC.±5mmD.±10mm
A.小于0.3mm/mB.小于0.2mm/mC.小于0.lmm/mD.小于0.05mm/m
A.5B.4C.3D.1