卷铰链的弯曲模是卷铰链的第（）道工序用的弯曲模。
A、一
B、二
C、三
D、四
参考答案：A
The Oscar Award is ______ all outstanding actors and actresses all ______. [ ]
A. what; dream to win
B. something; look forward to win
C. what; dream of winning
D. something; look forward to winning it
黄铜因（）含量比较高，焊接时会产生严重烟雾，损害焊工健康。
A、锌
B、锡
C、铝
D、硅
