Till now, there are such theories as Reliance theory, Rule of Law theory, Alternative Rule of Law theory, Legal Osmosis theory, and Economic Efficiency theory.

Study on optimization formula and infiltration regularity for major auxiliary burden of sugar-vinegar garlic;

The development of conception of permeability coefficient is introduced in this paper through the generation of Darcy s formula and study on the physical bases of K, testing for the real limitation of seepage law and practices of Dupuit s equation for waterwell.

The configuration parameters of UF surface pore size distribution, porosity and pore density were measured with scanning electron microscope (SEM), the field emission scanning electron microscope (FESEM) and permeability rate method.

The comparison of these means indicates that reverse osmosis has better adaptability in desalting brackish water with different salt contents and RO desalination of membrance separation technique is more effective than other brackish water desalination techniques.

In this article,several traditional physicochemical methods including reverse osmosis and ion exchange were presented,and their advantages,weaknesses and operating conditions were compared respectively.