A.prevent an unsafe ship proceeding to seaB.prevent a s……

单项选择题If two A.C.generators are to be operated in parallel, the load is distributed evenly by（）

A.means of rheostat the governor settings
B.a balance coil excitation
C.adjusting the governor settings
D.changing excitation

单项选择题The treatment of the fuel oils involves storage, heating, filtering and（）

A.centrifuging
B.pressurizing
C.atomization
D.igniting

单项选择题Which of the following items don’t belong to dock repair works?（）

A.making the repair list, booking spare parts and special tools for the dock repair
B.shutting off all of the S.W valves to outboard
C.the sketches or diagrams used for the dock repair
D.cleaning up the oil tank and boiler before enter the dock

单项选择题During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.

A.the highest
B.above 3/4
C.1/2 -3/4
D.the lowest

单项选择题（） is not installed on the main switchboar.

A.Ammeter and changeover switch
B.Power factor meter
C.Synchroscope
D.Reverse sequence relay