单项选择题
Before entering a tank，always check the vapor content（）a combustible gas indicator.
A.with
B.by
C.of
D.for
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相关考题
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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 -
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 -
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
