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“showed a trend”

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We know that C 2 H 6 /C 2 H 4 appeared later than C 2 H 4 , and as the temperature rose rapidly, it reached its maximum in the critical temperature range and then decreased rapidly. At the beginning of the experiment, CO 2 /CO first decreased and then increased with the increase of coal temperature, and as the temperature continued to rise, the CO 2 /CO showed a trend of rapid decline. 2.1.2.
When it comes to the energy sources, we can know that the CO 2 emissions from transport sector were induced from diesel and gasoline in most of cities and the share of diesel oil has showed a trend of growth from 2000 to 2017; i.e., the share of Handan, the city of Hebei province, is increased from 11.73 × 10 4 tons to 131.15 × 10 4 tons (approximately 68.23% of total emissions).