控制油田水结垢的方法主要是控制油田水中成垢离子或溶解气体的含量，也可以投加（）以控制垢的形成。 ["杀菌剂","氧化剂","阻垢剂","絮凝剂"]
低压开关的火灾原因是什么？怎样预防？
While troubleshooting a refrigeration system for low head pressure, liquid refrigerant flooding back from the evaporator is determined to be the causeIt may be necessary to （）. ["change the expansion valve adjustment","readjust the water regulating valve to increase the flow of water","purge air from the condenser","clean the waterside of the condenser"]
焊完后焊缝应立即去除（）、飞溅物，清理干净焊缝表面，然后进行焊缝外观检查。
铁细菌生长的适宜温度是（）℃。 ["5～15","10～20","22～25","30～40"]
低压配电盘的火灾原因是什么？怎样预防？
