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單項選擇題

Either a low injection pressure or a leakage of piston rings is able to lead （）.

A.a high exhaust temperature
B.a high smoky exhaust
C.a high output
D.a high compression

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單項選擇題

Each piston stuffing box is provided with two sealing rings and three（）

A.packings
B.piston rings
C.distributor rings
D.scraper rings

單項選擇題

Each journal and pin should be examined for （） and grooving.

A.bridges
B.recesses
C.rears
D.ridging

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