Cofferdam: Watertight enclosure from which water is pumped to expose the Bed of a Body of water in order to permit the construction of a pier or other hydraulicwork.
围堰：防水围护堤，将堤内的水抽尽，露出水底以便建造桥墩或其它水工结构。
2
This paper introduces the composition of double-heat sources system, the regulation of united operation of double-heat sources, hydraulicwork condition and operating regulation methods of pipeline.
介绍了双热源系统的组成、双热源联合运行时的规律以及管网的水力工况和运行调节方法。
3
DC motors work as power device of the hydraulic system in the project machinery, mainly matched with hydraulic pump.