Meth od Using the literature analysis method.
方法采用文献综述法。
Methods: Flocculating method and alcohol precipitation meth od were used.
方法：采用了醇沉法和絮凝法两种精制方法。
Based on the studying of gas interchangeability and disposal of pollutants, the optimum replacing method and the clean meth-od to utilizing LNG can be obtained.
通过燃气互换性和污染物排放及控制特性的研究，得到天然气置换其他燃气的最优方法，以及天然气洁净利用的方法。
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