题目内容

At least give him the __________ of explaining what happened.

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They have successfully __________ the old with the new in this room.

She _______ the video and went to answer the phone.

是将两个分离的金属工件，在接头处通过局部加热、加压或两者相结合的方式，使其连接成为一个整体的加工方法。

焊接的分类方法有很多，按其过程特点不同可分为、和。