单项选择题
The main purpose of the piston oil scraper rings is to （）.
A.seal the space between the piston and the liner
B.reduce the amount of lube oil burned in the combustion chamber
C.transmit heat from the piston to the cylinder liner
D.damp out fluctuations of the piston side thrust
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相关考题
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Maximum horsepower of a diesel engine is attained （）.
A.when the engine RPM is pulled down by overload
B.at rated engine RPM
C.at 95 % of rated engine RPM
D.at 95 % of a properly adjusted governor RPM with the engine under full load -
单项选择题
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A.temperature
B.pressure
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In diesel engines, the four basic events (intake, compression, power and exhaust) are performed once in （）.
A.two crankshaft revolutions in a two-stroke/cycle engine
B.two power strokes in a two-stroke/cycle engine
C.one power stroke in a two-stroke/cycle engine
D.two piston strokes in a two-stroke/cycle engine
