With bright and smooth surface, good security features, our product are lightweight, solid and widely used in gas, natural gas, chemical, water and other liquids pipeline welding.
产品轻盈坚固，表面光洁亮丽，安全性能好，广泛利用于燃气，天然气，化工，排水等其他液体管道的焊接。
The formation water in oil layer may have the same chemical features as the neighboring water lay-ers, or in contrast with each other.
油层中地层水的化学特征可能等同于邻近水层的化学特征，也可能与之完全不同。
The present status of chemical treatment of cooling water in Chinese petrochemical complex is reviewed. Three case histories are presented in this paper to show the distinct features.
综述了我国石化系统冷却水处理的现状，列举了三个实例以说明该行业冷却水处理的水平。
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