柱顶表面平整度应控制在（）mm，以十字交叉线检查两个方向。
A.3
B.5
C.8
D.10
参考答案：A
But for the help of my English teacher, I ________ the first prize in the English Writing Competition.
A．would not win
B．would not have won
C．would win
D．would have won
汽轮机临界转速
