单选题Which one of three elements for a fire on a tanker vessel is most difficult to eliminate (isolate)?（）Aa combustible element, fuelBenergy (resources for ignition) to start the combustionCoxygen to support the combustionDboth A and C are correct
单选题
Which one of three elements for a fire on a tanker vessel is most difficult to eliminate (isolate)?（）
A
a combustible element, fuel
B
energy (resources for ignition) to start the combustion
C
oxygen to support the combustion
D
both A and C are correct
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