题目内容

焊接电源绝缘的可靠性、接线的正确性、电源的动特性、接地的可靠性、电源的外特性等,在焊条电弧行检查。()

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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。()