The polytropic index can be calculated according to the experiment data of coal temperature, the free gas expansion work and adsorbed gas work can be calculated using polytropic index.是什么意思_The polytropic index can be calculated according to the experiment data of coal temperature, the free gas expansion work and adsorbed gas work can be calculated using polytropic index.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句