One of the main functions of wearing rings, as used in a centrifugal pump, is to （）.
1、The main function of tie rods in the c
The main function of tie rods in the construction of large, low speed diesel engines is to（）.Astiffen the bedplate in way of the main beari...
2、The main function of the lubrication s
The main function of the lubrication system in to enable （） of a film of oil between the moving parts.Athe informationBthe formationCthe scatterDthe frictio
3、One of the main differences between th
One of the main differences between the various types of screw pumps is in the （）.Astuffing box diameterBdirection of rotation of the screwsCpitch of the screwsDtype of driving gear
4、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
5、One function of the program is that it
One function of the program is that it allows the owner to ______ at a distance.A change some access details for switching on the laptopB tu...
6、One of the main purposes of refractori
One of the main purposes of refractories in a boiler furnace is to（）Ahelp preheat the air for the furnacesBhelp preheat the feedwaterCprotect economizer from excessive heatDprevent excessive furnace heat losse