单选题The atmosphere in a tank is too lean if it is（）.Aincapable of supporting combustion because the hydrocarbon content is below the LFL (Lower Flammable Limit)Bcapable of supporting combustion because the hydrocarbon content is above the UFL (Upper Flammable Limit)Ccapable of supporting a fire once startedDnot safe for ballasting
单选题
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
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