问题：
[单选] If the flame from combustion in the cylinder of a four-stroke engine past the piston into the space below, the accumulation of flammable mixture would be ignited, thus resulting in （）.
the crankcase explosion。lifting of the cylinder safety valve。a scavenge fire。opening of the manhole。
问题：
[单选] If the needle valve in a fuel injection nozzle sticks open （）.
no fuel will be delivered through the nozzle。the nozzle will overheat and crack。time of injection will change。fuel will leak into the drain line。
问题：
[单选] If the sump（）were to rise this would indicate water leakage into the oil an d an investigation into the cause must be made.
temperature。viscosity。lever。level。
问题：
[单选] If there is water in fuel oil, the revolution of the engine will （）.
decrease。increase。be dismantled。be reassembled。
问题：
[单选] In a （） engine the charge of air in the cylinder before compression commences is above atmospheric pressure.
pressure charged。naturally aspirated。contaminated。high speed diesel。
问题：
[单选] In a central cooling system, used in some modem ships, sea water is supplied to cool （）which will circulate to other individual cooler, greatly reducing the corrosion problems.
fresh water。sea water。cooling oil。emulsio。
问题：
[单选] In a central cooling system, used in some modem ships, sea water is supplied to cool （）which will circulate to other individual cooler, greatly reducing the corrosion problems.
main bearings。sea water。cooling oil。lower temperature fresh water。
问题：
[单选] In a commonly used fuel oil system, the oil is stored in tanks in the double bottom from which it is pumped to （） and heated.
a service tank。a settling tank。an expansion tank。a double bottom tank。
问题：
[单选] In a complete oil/water separator, more oil will separate out onto the underside of these plates and travel outwards until it is free to rise into the oil collecting space Whats the meaning of "it" in the sentence above?（）
a separator。oil。water。an oil collecting space。
问题：
[单选] In a diesel engine, fuel must be broken up into a spray of fine droplets to （）.
increase its quality。obtain complete burning。reduce its weight。all of the above。
