單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

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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