單項(xiàng)選擇題The main purpose of port State control is not to()

A.prevent an unsafe ship proceeding to sea
B.prevent a ship threatening the marine environment
C.fine the ships
D.confirm a safe sailing


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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題The treatment of the fuel oils involves storage, heating, filtering and()

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

3.單項(xiàng)選擇題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

5.單項(xiàng)選擇題() is not installed on the main switchboar.

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