熔化极电弧焊时，熔化焊条(或焊丝)的主要热量是电流通过焊条(或焊丝)时所产生的电阻热。
参考答案：错
--- John, where are the cookies? Don’t tell me you ate them all!
--- ______ I couldn’t help it. They were so good.
A．Yes, I did.
B．No, I didn’t.
C．Yes, I have.
D．Why? Sounds strange!
