In order for combustion to occur inside a piping system such as a vapor collection header in a marine emmission control system , there must be（）.<br>A:fuel<br>B:oxygen<br>C:ignition<br>D:All of the above

In order for combustion to occur inside a piping system such as a vapor collection header in a marine emmission control system , there must be（）.
A:fuel
B:oxygen
C:ignition
D:All of the above

出自：海船船员证

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