A、upwards；inwards
B、upwards；outwards
C、downwards；inwards
D、downwards；outwards
更多“The sealing function of the piston ring is brought about by the gas pressure above and behind the piston ring, which forces it （） against the bottom of the ring groove, and （） against the cylinder wall.”相关的问题
A、the good sealing performance and the simple structure B、the good sealing performance and the short life expectancy C、the good sealing performance but the short life expectancy D、the good sealing performance and the lower cost
A、transfer heat from the cylinder to the piston B、scrape oil from the sides of the piston C、seal the combustion space from the crankcases D、prevent any piston contact with the cylinder liner
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
A、A.prevent excessive cylinder liner wear B、B.reduce friction losses in the engine C、C.seal the space between the piston and the liner D、D.limit upward flow of lube oil into the combustion space
A、Absorb erosion of high velocity discharge stream B、Seal pump shaft against entry of air C、Isolate the outlet side from the inlet side D、Dampen the turbulent discharge flow
A、Absorb erosion of high velocity discharge stream B、Seal pump shaft against entry of air C、Isolate the discharge side from the suction side D、Dampen the turbulent discharge flow
A、combustion gas blow-by B、excessive lubrication C、properly functioning rings D、insufficient cylinder cooling
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