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
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相关考题
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单项选择题
Oil will lubricate these parts （） effectively than water.
A.much
B.more
C.most
D.less -
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.
A.lower than；can lubricate
B.lower than；can cool
C.higher than；can enter
D.higher than ；cannot enter -
单项选择题
Oil is supplied to the cylinder wall and （） by means of mechanical lubricators.
A.the cylinder cover
B.the piston rings
C.the piston crown
D.the piston skirt
