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單項選擇題

Oil will lubricate these parts （） effectively than water.

A.much
B.more
C.most
D.less

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單項選擇題

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

單項選擇題

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