单选题Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because().AThe direction of pressure on the journal in four-stroke engine is continuouslyBpositive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engineCfour-stroke engines usually utilize a heavier grade of oil than tow-stroke enginesDLow-stroke engines usually consume less lube oil than four-stroke engines

单选题
Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because().
A

The direction of pressure on the journal in four-stroke engine is continuously

B

positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engine

C

four-stroke engines usually utilize a heavier grade of oil than tow-stroke engines

D

Low-stroke engines usually consume less lube oil than four-stroke engines


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