On-demand pumps have a pressure switch that makes the pump build up pressure in the fresh water line.
按需水泵有一个压力开关，使泵在淡水输送线上产生压力。
We are exporters of fresh water pearls having years' experience in this particular line of business.
我们作为淡水珍珠的出口商，在这一业务方面有着多年的经验。
The line is mainly used in producing PVC pipe materials. The pipes are widely used in pipes of fresh-water, sewer.
该生产线主要用于生产PV C管材，生产的管材广泛适用于建筑用上水管、下水管及排水用管道。
Feasibility, validity and other problems of line transect survey method in shallow fresh water lake were also discussed.
探讨了截线抽样法用于浅水型淡水湖泊调查的可行性和有效性以及要注意的问题。
For the best system performance, install on the fresh water feed line before any pressure regulators (such as the watts series 1156 on a residential boiler application).
为了获得最好的系统性能，在任何压力调节器(如家用锅炉电器上应用的美国瓦茨系列1156)之前，要安装淡水进水管。
But because of mankind of disorderly line up dirty water, throw garbage in disorder, cause water pollution, the fresh water resources reduces gradually.
但是由于人类的乱排污水，乱扔垃圾，引起水污染，淡水资源逐渐减少。
But because of mankind of disorderly line up dirty water, throw garbage in disorder, cause water pollution, the fresh water resources reduces gradually.
但是由于人类的乱排污水，乱扔垃圾，引起水污染，淡水资源逐渐减少。
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