轧制时（）的一段区域称为变形区。
参考答案：从轧件与轧辊接触开始至轧件离开轧辊
The winter of 1990 was extremely bad. _____ most people say it was the worst winter of their lives. [ ]
A. At last
B. In fact
C. In a word
D. As a result
深井泵的标准图例为（）。
A.
B.
C.
D.
A.A
B.B
C.C
D.D
