單項(xiàng)選擇題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


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1.單項(xiàng)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

2.單項(xiàng)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

3.單項(xiàng)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

4.單項(xiàng)選擇題The oil discharge monitoring system in the oil tanker vessels is used for detecting the amount of oil discharged overboard to ensure that it does not exceed（）

A.15 liters nautical mile
B.30 liters nautical mile
C.60 liters nautical mile
D.100 liters nautical mile