In this paper, coal gangue was activated through calcinations at different temperatures, and the systematic research was carried out about the activation mechanism and the hydration course.

本文采用不同温度煅烧方法激活煤矸石，并对其活化机理和水化过程进行系统探讨。

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While some timber and paper factories are still operating, only one coal mine remains open.

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One university scientist even wrote a paper alleging that greenhouse emissions from shale gas production are worse than the burning of coal.

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