题目内容

焊工的作业面积应大于( )m2。

A. 2
B. 3
C. 4
D. 5

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预热温度为400℃左右是铸铁补焊的( )。

A. 加热减应区法
B. 半热焊法
C. 不预热焊法
D. 热焊法

由于纯铜导热率高,所以气焊时,火焰能率应( )。

A. 比低碳钢小1~2倍
B. 比低碳钢大1~2倍
C. 和低碳钢相同
D. 比低碳钢大3~4倍

铝及铝合金焊丝根据化学成分可分成纯铝、铝镁、铝铜、铝锰及铝硅几大类。()

A. 对
B. 错

From the passage we may come to the conclusion that ______.

A. joining big companies are more beneficial to graduates
B. smaller companies are the best choice for graduates
C. graduates should listen to their parents' opinions when choosing a job
D. both big companies and small ones have their own advantages and disadvantages

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