“世界上没有无缘无故的爱，也没有无缘无故的恨”，这符合人际关系原则中的功利性原则
Where must the master or person in charge of a ship record the date of each test of emergency lighting and power systems and the condition and performance of the equipment（）. ["On the Certificate of Inspection","On the station bill","In the Operations Manual","In either the official or unofficial log"]
客车空调装置的控制线路中设有欠压保护器，当供电电压低于额定电压的（）时，自动切断电源，停止运行，保护电机。 ["5%～8%","10%～15%","18%～20%","20%～25%"]
交换行名册维护是将参加交换的各网点信息录入到系统内，系统针对于对方交换行号自动反显交换行名。
KLC40[2]-1T1型空调机组压缩机停机后，为避免立即起动造成过载，设有延时继电器控制，实现至少延时（）才能再起动的背压起动保护。 ["30s","60s","90s","120"]
数字电液调节系统的总体功能是什么？
