单项选择题
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（）.
单项选择题 According to the regulations，normally，manholes in LFG tanks are located（）.
单项选择题 According to the Chemical Data Guide，when burning，the grade B flammable liquid，carbon disulfide produces（）.