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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

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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

單項選擇題

Modem engines make use of exhaust gas driven turbo-chargers to supply pressurized fresh air for （） and supercharging.

A.scavenging
B.starting
C.cooling
D.blowing

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