单项选择题
The system will include various （） such as low tank level alarms and remote operation of tank outlet valves in the events of a fire.
A.Switches B.panels C.alarm units D.safety devices
单项选择题 Electric insulation is made of organic substances and so gradually （） with age.
单项选择题 On commonly used ships,if two A√Cgenerators are operated in parallel, the load is distributed evenly by （）.
单项选择题 Moisture in a D-Cmotor would cause （）.
