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“showed a trend”

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Among them, the concentrations of O 2 , CO, CH 4 , CO 2 , C 2 H 4 and C 2 H 6 , a total of six single gases, showed a trend of slow change to rapid growth in the process of coal temperature rise, which can effectively identify the gas release characteristics of the critical temperature, the dry cracking temperature and the pre-spontaneous combustion period, while the gas release characteristics of CO/△O 2 , CO/CO 2 , CO
Analysis of photosynthetic characteristics revealed that with the progression after anthesis, the net photosynthetic rate, stomatal conductance, and transpiration rate of flag leaves of different types of wheat generally showed a trend of first decreasing, then increasing, and then decreasing again, while the intercellular carbon dioxide concentration gradually increased.