主轴的轴向窜动和径向跳动会引起()。
A、机床导轨误差
B、夹具制造误差
C、调整误差
D、主轴回转运动误差
参考答案:D
His grandfather sometimes _____ him on Sundays. [ ]
A. is going to see
B. is coming to see
C. comes to see
D. go to see
外因性不均称型叙述下列哪项正确()
A.出生后外表无营养不良表现
B.出生后躯体发育不正常
C.胎盘体积正常,但功能下降
D.各器官细胞数量不正常
E.胎儿无代谢不良