单项选择题
A.an alternating B.a rush C.a direct D.an exciting
Shore power must be（） during dock repair.A.disconnected...
单项选择题Shore power must be（） during dock repair.
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
