单项选择题
Modern marine diesel engines equipped with mechanical fuel injection operate on a combustion phase within the cycle which is（）
A.entirely constant pressure
B.entirely constant temperature
C.a combination of constant volume and constant pressure
D.a combination of constant temperature and constant pressure
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相关考题
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单项选择题
The over-speed trip device installed in some diesel engines is automatically actuated by（）
A.spring force
B.hydraulic pressure
C.centrifugal force
D.mechanical linkage -
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 -
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
