全挂车倒车时转向盘转动方向与单车倒车方向相反。
参考答案:错
Please don’t disturb Tom! He is busy now, with a lot of work ____.
A.done with
B.to do with
C.doing with
D.to be done with
纤维的混合在罗拉梳理机上是如何完成的?影响纤维混合的因素有哪些?