单项选择题
A.bilge well connected to that valve, plus the second bilge well being pumped will be completely emptied
B.bilge system will lose vacuum and prevent the other bilges from being pumped out
C.bilge well aft connected to that valve will siphon its contents to the forward bilge wells
D.discharge pressure will be too high
单项选择题 An exhaust gas bypass is installed on a waste heat boiler in order to （）.
单项选择题 Which of the following actions should be taken if during a routine maintenance inspection of a centrifugal pump, localized scoring on a pump shaft sleeve is detected?（）
单项选择题 Which of the materials listed is used as the dynamic seal material on mechanical seals installed on most centrifugal pumps used in water service?（）