单选题If emergency welding repairs must be made to the upper area of a fuel tank, the tank and/or adjacent compartments may need to be （）Agas freedBinertedCfilled with waterDall of the above as necessary
单选题
If emergency welding repairs must be made to the upper area of a fuel tank, the tank and/or adjacent compartments may need to be （）
A
gas freed
B
inerted
C
filled with water
D
all of the above as necessary
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