The atmosphere in a tank is too lean if it is（）.<br>A:incapable of supporting combustion because the hydrocarbon content is below the LFL (Lower Flammable Limit)<br>B:capable of supporting combustion because the hydrocarbon content is above the UFL (Upper Flammable Limit)<br>C:capable of supporting a fire once started<br>D:not safe for ballasting

The atmosphere in a tank is too lean if it is（）.
A:incapable of supporting combustion because the hydrocarbon content is below the LFL (Lower Flammable Limit)
B:capable of supporting combustion because the hydrocarbon content is above the UFL (Upper Flammable Limit)
C:capable of supporting a fire once started
D:not safe for ballasting

出自：海船船员证

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