焊缝金属过烧，碳元素大量烧损，焊接接头强度提高，韧性和塑性下降。
参考答案：错
I don’t think the newly-directed film by Zhao Wei is as interesting as people say, _____?
A．do you
B．isn’t it
C．is it
D．don’t you
聪明:愚蠢
A．男人：女人
B．黑色：白色
C．墨镜：光明
D．财富：贫困
