單項(xiàng)選擇題

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

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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