车床可加工的八种回转表面是哪八种?
参考答案:车外圆 车端面 镗内孔 车槽 钻孔 车锥面 车螺纹 车成型面
All witnesses _____ to the traffic accident are required to make their statements.
A.appropriate
B.accessible
C.relevant
D.suitable
鼻腔、鼻窦不动纤毛综合征