The methods of purification for naphthenic acid consist of physical method and chemical method.
环烷酸的提纯方法主要有物理方法和化学方法。
The treatment of those compounds may be classified to physical method, chemical method, physical & chemical method and biodegradation method.
这些有毒有害物的处理技术可概括为物理方法、化学方法、物理化学方法和生物降解法。
The physical desulfurization method, chemical desulfurization method and biological desulfurization method are three important methods of coal desulfurization technology.
物理脱硫法、化学脱硫法、生物脱硫法是煤脱硫技术的三种主要方法。
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