题目内容

()是一种C02焊可能产生的气孔

A、氧气孔
B、NO气孔
C、C02气孔
D、CO气孔

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What’s the meaning of “prodding” in the video()

A. encouragement
B. punishment
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()不是C02焊时选择焊接电流的根据

A、焊件厚度
B、焊丝直径
C、施焊位置
D、电源种类与极性

It is reasonable for people to pursue a career in fields related ____ their favorite hobbies()

A. for
B. on
C. to
D. with

It was because of his good performance at the interview ____ he got the job with the big company()

A. so
B. while
C. what
D. that

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