题目内容

低温钢焊接时的焊接方法：和应用较广，应用受到限制，一般不采用和。

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低温钢焊接采用奥氏体焊接材料时，热裂纹倾向随着焊缝中Ni含量提高而减小。

A. 对
B. 错

31. Our president congratulated us on our outstanding performance and the great (achieve) ___ we have made in the past few year.32. You should look over this document carefully before (sign) _ it.33. This City Guide gives business travelers all the information they need (plan) their trip.34. The company (found) over 20 years ago in Shenzhen by a Chinese businessman.35. ABC Company tries hard for excellence with a committed attitude to carry out business (proper)_.

下列词语中是轻声的有（）。

A. 快乐
B. 质量
C. 爱人
D. 效率

一个音节变成轻声后，它的（）会发生变化。

A. 音高
B. 音强
C. 音长
D. 音色