单项选择题
A.with B.by C.of D.for
After the initial cleaning of flue gas in an inert gas ...
单项选择题After the initial cleaning of flue gas in an inert gas system the gas is passed through what device for final cleaning?（）.
A.Scrubber B.Demister C.Deck water seal D.Final filter
According to the regulations，to prevent excessive press...
单项选择题According to the regulations，to prevent excessive pressure buildup in cargo tanks containing LFG，they are fitted with（）.
A.pressure vacuum relief valves B.excess flow valves C.safety relief valves D.flame screens
According to the regulations，normally，manholes in LFG t...
单项选择题According to the regulations，normally，manholes in LFG tanks are located（）.
A.in the ends of each tank B.in the expansion trunk of each tank C.above the weather deck D.there are no requirements in the regulation
