单项选择题
A.投影线裁剪B.线裁剪C.参考线裁剪D.面裁剪
A.PHOTOSHOP B.FLASH C.UG D.AUTOCAD
A.机床切削是,刀具夹头碰撞到工件B.机床运行时,主轴转速过高C.机床运行时,刀具装夹不牢固D.机床切削时,刀具夹头碰撞到工件;机床运行时,主轴转速过高;机床运行时,刀具装夹不牢固均可