單項選擇題

What type of electric motor is most commonly used on board ship?（）

A.non-synchronous electric motor
B.synchronous electric motor
C.fully enclosed electric motor
D.watertight electric motor

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單項選擇題

Which of the following statements is not true concerning symptom of a fire in the scavenge air box?（）

A.an increase in the exhaust temperature of the affected cylinder
B.the turbocharger may surge
C.the explosion pressure in all cylinders will rise violently
D.smoke from the turbocharger air inlet filter will be seen

單項選擇題

Which of following functions is not one of the functions of air conditioner?（）

A.refreshing the air
B.making person upset
C.adjusting the air humidity
D.adjusting the air temperature