In open cycle condition, the frequency of the cleanness should base on cooling water quality.
在开式循环的情况下，清洁的间隔时间长短要根据冷却水的性质而定。
Most of the coastal sea areas experienced good water quality despite continued severe pollution in some areas. Water quality of high sea areas remained in good condition.
除部分地区污染状况加剧外，大部分海洋地区水质良好。深海地区水质状况维持在较好的状态。
Objective To understand condition of tap water quality in Zhanjiang City, and provide scientific basis for improvement of water quality.
目的了解湛江市区自来水水质状况，为改善水质提供科学依据。
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