焊完后焊缝应立即去除渣皮、飞溅物，清理干净焊缝表面，然后进行（）。
在Excel中，函数MAX（3，5，7，4，2）的值是（）。 ["5","7","3","#VALUE!"]
什么是个人礼仪？
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In the refrigeration system, a shortage of refrigerant is indicated by （）. ["the compressor short cycling on high pressure cut out switch","high suction pressure","high head pressure","bubbles in the sight gla"]
点焊必须焊透；点焊处有裂纹、气孔、夹渣缺陷时应铲除重焊，必须在（）合格后方可全面施焊。
