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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

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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

單項選擇題

No specific period is given for the renewal of the lubricating oil filter element as this should be done（） a figure of 0√7 bars is shown on the gauge.

A.whatever
B.whenever
C.wherever
D.whoever

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