单项选择题
On a diesel engine, fuel is delivered into the combustion space by （）.
A.a cooling system B.a lubrication oil system C.an electric system D.an injection system
单项选择题 Oil will lubricate these parts （） effectively than water.
单项选择题 Oil pressure in the lubrication system is （） the static sea water head to ensure that sea water （） the stem-tube.
单项选择题 Oil is supplied to the cylinder wall and （） by means of mechanical lubricators.
