A.只许内凹
B.不许外凸
C.只许外凸
D.不许内凹
床身刮研时,刮平导轨Ao以A1导轨为基准测量两导轨的扭曲度,在专用桥板上放水平仪,要求(),直线只许中凸,要求直线度0.005mm/1000mm,0.01mm/全长。
A.0.002mm/1000mm,0.01mm/全长
B.0.003mm/1000mm,0.015mm/全长
C.0.005mm/1000mm,0.01mm/全长
D.0.004mm/1000mm,0.02mm/全长
A.20mm2
B.25mm2
C.30mm2
D.35mm2
A.S7
B. S6
C. S5
D. S4