问题 问答题 简答题

焊接变形的形式有哪几种?焊接的主要缺陷有哪些?

答案

参考答案:

焊接变形的基本形式有:收缩变形、角变形、弯曲变形、扭曲变形、波浪形变形。焊接的主要缺陷有气孔、固体夹杂、裂纹、未焊透、形状缺陷。

材料分析题

材料:2008年3月14日,拉萨极少数人进行打、砸、抢、烧破坏活动,扰乱社会秩序,危害人民群众生命财产安全。遭到包括海外华侨在内全国人谴责和抗议。

(1)全国人民谴责和抗议拉萨3.14事件原因是什么?

                                                                                                                                                              

                                                                                                                                                             

(2)从法律的角度讲,进行打、砸、抢、烧破坏活动是一种犯罪行为,为什么?

                                                                                                                                                            

(3)为了构建和谐民族关系,青少年应该怎样做?

                                                                                                                                                              

                                                                                                                                                               

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