Why is the ring belt narrower in diameter than the skirt of a piston designed for a diesel engine?（）
1、Why a gearbox is needed in a ship driv
Why a gearbox is needed in a ship driven by a medium-speed diesel engine?（）ATo reduce the main engine speedBTo increase the main engine speedCTo govern the main engine speedDTo fix the propeller shaft
2、If the gas pressure behind the ring is
If the gas pressure behind the ring is built up too slowly, and thereby exerts an inadequate outward pressureIn such a case, the combustion g...
3、Why is listening important in learning
Why is listening important in learning English?
4、A diesel engine piston ring face is in
A diesel engine piston ring face is in direct contact with the （）.Atop of the ring grooveBcylinder liner oil filmCbottom of the ring grooveDback of the ring groove
5、The lowest ring of a piston is （）.
The lowest ring of a piston is （）.Aa coil springBa sealing ringCan oil distributor ringDmain seal ring
6、What is a function of the wearing ring
What is a function of the wearing rings used in most centrifugal pumps?（）AAbsorb erosion of high velocity discharge streamBSeal pump shaft against entry of airCIsolate the discharge side from the suction sideDDampen the turbulent discharge flow