多晶体的塑性变形主要是以位错方式进行的,并且是不均匀的。
参考答案:错
()不是产生吊板的原因。
A、铺设桥面施工的误差
B、挠度过大
C、枕木材质不一
D、个别桥枕机械磨损较大
You will have an idea of what a hard life the working people________at that time after you read the book. [ ]
A. enjoyed
B. shared
C. managed
D. lived