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问题
单项选择题
导柱与导套一般选用20号低碳钢，表面经（）淬火处理。
A、高频
B、中频
C、渗碳
D、火焰表面
答案
参考答案：
C
解答题
竖式计算
269+978
1032-829
276×5
507×4
59÷8
820×5．
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选择题
— I ____ to a party, but I've got nothing to wear.
— Why don't you have a dress made for the party?
A. was asked
B. will ask
C. have asked
D. have been asked
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