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骑座式管板仰焊位盖面焊采用多道焊时可有效防止产生咬边缺陷,外观平整、成形好。()

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珠光体钢和奥氏体不锈钢厚板对接焊时,可先在奥氏体钢的坡口上用珠光体型焊接材料,采用单道焊的层。()

Many Americans find silence uncomfortable during a buffet or a formal dinner. So in the States there is a widespread practice of making "small talk" in certain social situations. Small talk deals with various topics superficially, simply for the sake of keeping a conversation going. The topics might include the weather, sports, college courses, clothing, food, etc. Small talk is especially useful at social gatherings when you meet someone for the first time, or when polite conversation is expected but no serious discussion is desired. It is common but not necessarily expected that one knows someone in a group before engaging with him or her in conversation. However, at a party or other informal social gathering, a simple "May I join you？" and a self-introduction is normally sufficient to gain acceptance into a group and to join in a conversation. In some places, such as the lobby of a concert hall or theater, a waiting room or a classroom, it is common for strangers to start a conversation even without an introduction.

应检查电焊钳的导磁性、隔热性、夹持焊条的牢固性和耐腐蚀性。()

珠光体钢和奥氏体不锈钢焊接,选择奥氏体不锈钢焊条作填充材料时,焊缝会得到奥氏体不锈钢成分。()