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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1.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

2.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

3.單項(xiàng)選擇題According to regulations，a cargo hose used for transferring liquefied gases must have a bursting pressure of（）.

A.5 times the maximum working pressure on the hose during cargo transfer
B.one half the designed working pressure
C.4 times the pressure of the cargo pump used for transferring
D.5 times the minimum working pressure on the hose during cargo transfer

5.單項(xiàng)選擇題A spark arrestor（）.

A.keeps sparks from falling into an open tank
B.secures covers on ullage openings
C.prevents sparks from getting out of an engine's exhaust system
D.grounds static electricity