单项选择题
A.cools the inert gas and prevents soot from entering the cargo tanks
B.acts as an emergency shutdown when inlet pressures exceed the safe working pressure
C.prevents the backflow of hydrocarbon gasses into nonhazardous areas
D.relieves sudden large overpressures in the system
单项选择题 The component in an inert gas system used for cleaning the gas of solid and sulphur combustion products，while simultaneously cooling the inert gas，is called the（）.
单项选择题 The combined fan discharge rate in an inert gas system is related to the（）.
单项选择题 The blowers of an inert gas generation system aboard a tanker，will be automatically secured if（）.