Why are removable sleeves installed on centrifugal pump shafts?（）
1、The boom stops are installed on an off
The boom stops are installed on an offshore crane to（）.Aprevent the boom from being raised too highBprevent the boom from swingingCsupport the boom when not in useDprevent the boom from being lowered
2、Intercoolers installed on starting air
Intercoolers installed on starting air compressors, reduce the possibility of（）Adust entering the high pressure stageBlube oil carbonizationCdischarge pulsationsDinter-stage vapor lock
3、Bottom blow valves are installed on au
Bottom blow valves are installed on auxiliary water-tube boilers to （）Aremove suspended and precipitated solids from the boiler waterBcompletely...
4、That REMOVE ANY LIST ON THE V/L AFTER
That REMOVE ANY LIST ON THE V/L AFTER EACH WATCH END means that（）.Aany list，no matter where it is posted，shall be removed prior to ending...
5、Exhaust gases are generally removed fr
Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by（）Anatural aspirationBmasked intake valvesCair cellsDscavenging air
6、Why is a special substance painted on
Why is a special substance painted on the tree? Trees should only be pruned when there is a good and clear reason for doing so...