单项选择题
Before starting a gasoline engine on a motorboat，you should make sure for safety that（）.
A.the gasoline tank is full
B.the bilges，cabins，etc. are thoroughly ventilated
C.you have fresh water on board
D.Each of the above is followed
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相关考题
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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 -
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
