切削过程中,工件表面会形成三个表面,分别是哪些?
参考答案:
1待加工表面;
2已加工表面;
3加工表面。
广告策划书的内容要点包括:()
A.市场分析
B.广告策略描述
C.广告实施计划
D.广告活动的效果评价和监控
If a shipper has strict arrival and departure requirements, which kind of transport mode he should consider firstly?()
A.Railroad
B.Motor
C.Both of them
D.Neither of them