单项选择题
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
Modern marine diesel engines using mechanical fuel inje...
单项选择题Modern marine diesel engines using mechanical fuel injection, operate on a combustion cycle which is（）
A.a combination of constant volume and constant pressure B.a combination of constant temperature and constant pressure C.entirely constant pressure D.entirely constant volume
The function of the piston compression rings used in a ...
单项选择题The function of the piston compression rings used in a diesel engine is to （）
A.seal the space between the piston and liner B.transmit heat from the piston to the cylinder liner C.reduce the amount of combustion gas blow-by D.all of the above
What determines the number of events occurring in a cyc...
单项选择题What determines the number of events occurring in a cycle of operation in an internal combustion engine?（）
A.Crankshaft revolution B.Type of engine (diesel or gasoline) C.Distance a piston travels during a stroke D.Number of pistons
