It is easier to replace a dry cylinder liner than a wet one because（）
1、It is possible to mount a double sucti
It is possible to mount a double suction centrifugal pump impeller with the vanes facing in the wrong directionThis would cause the pump （）.Ahead capacity to improveBdischarge to be reversedCefficiency to decreaseDslippage to decrease
2、It is essential for（）to give a complet
It is essential for（）to give a complete description of damage and shortage in the discharging report.Athe office staffBthe terminal staffCthe ship's crewDthe insurance company
3、It is illegal for a public official to
It is illegal for a public official to ask people for gifts or money ______favors to them.A in preference toB in place ofC in agreement withD in exchange for
4、A-frames and cylinder block is held to
A-frames and cylinder block is held together by （） to form a rigid structure.Aconnecting rodsBpiston rodsCtie rodsDjack-bolt
5、When it is necessary to open a refrige
When it is necessary to open a refrigeration system for repairs and the system will be open for more than a few minutes, the open ends of the system should be （）.AdehydratedBpurgedCpluggedDevacuated
6、When it is necessary to remove a victi
When it is necessary to remove a victim from a life threatening situation，the person giving first aid must ().APull the victim by the feetBAv...