未分类题

啃轨原因有( )。

A.车轮加工或安全有缺陷
B.轨道安装偏差太大
C.传动系统侧差引起的
D.金属结构变形，使车轮对角线不等

【参考答案】

A,B,C,D

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未分类题

润滑材料的主要作用有( )。

单项选择题

-Its such a perfect day. Say, why donwe pack a picnic lunch and go to the park? We can invite some other people to come to—Nancy, Rob, charlotte, Ben, their kids…-（）-Anything is fine with me.

A.That's one of the best ideas l've heard in weeks. What should we take on the picnic?
B.I'd like to very much，but I have to prepare for my examination.
C.That's great！Shall we go to the seaside for a walk?