其浓度随燃烧的进行逐渐下降，并且表现出在急燃期快速降低，缓燃期和后燃期变化较小的趋势。
The trend of the C-H got lower and lower, and it decreased rapidly at the starting of the combustion but slowly afterwards.
其浓度随燃烧的进行逐渐下降，并且表现出在急燃期快速降低，缓燃期和后燃期变化较小的趋势。
The trend of the C-H got lower and lower, and it decreased rapidly at the starting of the combustion but slowly afterwards.
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