单项选择题
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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相关考题
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单项选择题
Each piston stuffing box is provided with two sealing rings and three（）
A.packings
B.piston rings
C.distributor rings
D.scraper rings -
单项选择题
Each journal and pin should be examined for （） and grooving.
A.bridges
B.recesses
C.rears
D.ridging -
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Each cylinder liner on the marine medium speed engines （）.
A.is usually cooled by sea water
B.can be replaced when worn out
C.is in direct contact with the water in the bore of the cylinder
D.can t expand when heated
