单项选择题
A.disconnected B.switched off C.cut off D.connected
The coil of wire rotating in the magnetic field produce...
单项选择题The coil of wire rotating in the magnetic field produces the（）.
A.voltage B.current C.power D.frequency
（） is used to produce electric power.A.An alternatorB.f...
单项选择题（） is used to produce electric power.
A.An alternator B.fresh water generator C.A compressor D.A clarifier
The system will include various （） such as low tank lev...
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
