单项选择题
What is head tank in the closed cooling water system used for?（）
A.for the release of air from the cooling water
B.providing expansion room for heated cooling water
C.a place for implementing water and water treatment agent
D.all of the above
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According to the principle of four stroke diesel engine, what is the number of its efficient work stroke per revolution?（）
A.1/2
B.1
C.2
D.3 -
单项选择题
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 -
单项选择题
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
