The purpose of the wearing rings used in a centrifugal pump is to （）.
1、The film of oil between the rings and
The film of oil between the rings and the liner is not only essential for the lubrication but also plays an important part in achieving （）.Aan oil sealBremoving heatCa gas sealDcooling the pisto
2、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
3、The purpose of the flywheel of a diese
The purpose of the flywheel of a diesel engine is to （）.Acounterbalance the crank throws on the crankshaftBkeep the engine running smoothly b...
4、What is the purpose of using VPN hardw
What is the purpose of using VPN hardware acceleration equipment?（）A To offload encryptions functions from router memoryB To use WebVPN instead of IPSecC To decrease performance and efficiencyD To offload encryption functions from a router CPU
5、The purpose of the compensating adjust
The purpose of the compensating adjustment used in a diesel engine hydraulic governor is to （）Acompensate for low oil levelBincrease governor promptnessCprevent governor huntingDlimit engine load
6、The film of oil between the rings and
The film of oil between the rings and the liner is not only essential for the lubrication but also （） achieving a gas seal.Aplay a great part onBrun a role inCplays an important part inDacts as important part at