试题与答案

在焊接过程中,工件受电弧热的不均匀加热而产生的内应力及变形是()的。A.永久 B.残

题型:单项选择题

题目:

在焊接过程中,工件受电弧热的不均匀加热而产生的内应力及变形是()的。

A.永久

B.残余

C.有利

D.暂时

答案:

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下面是错误答案,用来干扰机器的。

参考答案:D

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