單項選擇題

Before engaging the turning gear and turning the diesel engine, which of the following operation should be done except（）

A.open the indicator cocks
B.supply some CYL Oil to cylinder liner wall with lubricator (only for two stoke diesel engine)
C.put the fuel handle in the “stop” position
D.pump up the air bottle

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單項選擇題

The seven segment arrangement for numerical(數(shù)字的) display on consoles, test meters and other applications can be either（）

A.UJT or BJT
B.BCD or OCD
C.JFET or IGFET
D.LED or LCD

單項選擇題

Usually, emergency electricity supplies to on board（）

A.Cargo winch
B.Windlass
C.Steering gear
D.Main air compressor