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

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

出自：海船船员证

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