單項(xiàng)選擇題

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

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

According to the Chemical Data Guide，when burning，the grade B flammable liquid，carbon disulfide produces（）.

A.phosgene gas
B.sulfuric acid gas
C.sulfur dioxide gas
D.carbon tetrachloride

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