以下消息类型中属于七号信令网管理消息的有（）。 ["SIO","TFP","SLTM","UDT","COA","ACM"]
合成脂肪和磷脂除了要ATP外，还必需有（） ["GTP","UTP","CTP","dATP","cAMP"]
夏季，制冷剂空调系统室外侧换热器称为什么？
The steam coils in a high pressure evaporator used for saltwater service should be de-scaled with （）. ["a needle gun","soap and water","a wire brush","a chipping hammer"]
地表层多为松软地层，为防止井口塌塌和装井口防喷器等需要，每口井通常都要下（），管外用水泥封固。 ["表层套管","技术套管","油层套管","特殊套管"]
通信设备发生故障时的处理原则是什么？
