单项选择题
A.spring force B.hydraulic pressure C.centrifugal force D.mechanical linkage
The flywheel reduces speed fluctuations by （）A.maintain...
单项选择题The flywheel reduces speed fluctuations by （）
A.maintaining a constant rack setting B.storing kinetic energy C.maintaining equal exhaust pressure D.maintaining even camshaft speed
How often should the lubricating oil of a diesel engine...
单项选择题How often should the lubricating oil of a diesel engine be changed?（）
A.After every trip B.Every 4000 hours C.According to manufacturer’s instructions D.Every time they are shutdown
The main function of piston compression rings is to （）A...
单项选择题The main function of piston compression rings is to （）
A.prevent excessive cylinder liner wear B.reduce friction losses in the engine C.seal the space between the piston and the liner D.limit upward flow of lube oil into the combustion space
