检测坐标镗床工作台移动后的定位精度,必须在()进行。
A.工作台夹紧状态
B.工作台松开状态
C.工作台工作状态
D.任意状态
参考答案:A
I've never read a better book than this one._____, it is the best one that I have ever read. [ ]
A. Since then
B. In other words
C. At times
D. In some ways
160km/h及以下区段,吊弦间距安全值不大于()。
A、8m
B、10m
C、12m
D、15m