单项选择题
A.inductive B.resistance C.combined D.capacitate
The separate supplies are connected in either star or d...
单项选择题The separate supplies are connected in either star or delta formationThe star formation is most commonly used and requires（） slip-rings on the alternator.
A.two B.three C.four D.five
After a ship enters service it is（） for the main bus-ba...
单项选择题After a ship enters service it is（） for the main bus-bar to be made dead.
A.usually B.commonly C.exceptional D.unavoidably
（） is a machine by which electrical energy is transform...
单项选择题（） is a machine by which electrical energy is transformed into mechanical energy.
A.An alternator B.An electric motor C.A diesel engine D.A main switchboard
