However fast or slow the combustion rate, it is still a （） between carbon, hydrogen, sulphur and oxygen that releases heat.<br>A:physical deformation<br>B:state exchange<br>C:chemical reaction<br>D:coalescence

However fast or slow the combustion rate, it is still a （） between carbon, hydrogen, sulphur and oxygen that releases heat.
A:physical deformation
B:state exchange
C:chemical reaction
D:coalescence

出自：海船船员证

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