问题：
[单选] （） neutralizes the acid conditions and（） cleanses the rings and grooves.
The detergency；the alkalinity。The alkalinity；the detergency。The inhabitant；the water。The additives；the distilled water。
问题：
[单选] （） or air venting arrangement is fitted to the fuel supply passage.
An air pump。A compressor。A fuel pump。A priming。
问题：
[单选] （） providing lubricating films, oil used in marine diesel engines have to remove heat from oil cooled piston.
Except for。Beside。Except。In addition to。
问题：
[单选] （） the engines, the diesel engine is（） used engine on board.
Between；more commonly。Among；the most commonly。Between；not more commonly。Among；not the most commonly。
问题：
[单选] （） water is more expensive than fresh water It has high specific heat and low viscosity.
Distilled。Distilling。Boiling。Boiled。
问题：
[单选] （） for the camshaft gear train is taken from a spur gear which for a six cylinder engine is at the coupling end.
The driven gear。The drive。The grease。The lubricating oil。
问题：
[单选] （） in what position the engine stops there will always be at least one of the cylinders with its starting air valve open to admit compressed air to start the engine.
Because。Owing to。For。No matter。
问题：
[单选] （） usually helps to induce air movement to assist combustion.
Cylinder cover。Main bearing。The exhaust valve。The piston movement。
问题：
[单选] （） supplies pilot air to control the cylinder air start valves.
An air compressor。An indicator cock。An air distributor。A safety valve。
问题：
[单选] （） clearances in the main or crank pin bearings will sometimes be indicated by loss of pressure in the lubricating system before any bearing knock is heard.
Too larger。Too smaller。Excess。Excessive。
