题目内容
Lubricating systems for diesel engines are usually designed to initially provide lube oil to theengine( )
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Oil is supplied to the cylinder liner wall and the piston rings by means of( ) giving a carefully controlled oil feed, through injectors or quills.
In some designs, cylinder oil supplying is timed so that the oil impinges only on( ) thus ensuring the most efficient lubrication.
Steam generated by boilers may be used for driving the main engine when( ) are fitted.
Circulation in a water-tube boiler is caused by the difference in the( )
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