The parallel blade damper is the ZD series damper. These dampers have been designed to provide long life, silent operation and require zero maintenance.
平行叶片风门是ZD系列风门。这些风门的设计使用寿命很长，运行安静，不需要进行维护。
2
The utilized method was to transform the paralleloperation of circulating water via condenser to series operation.
所采用的方法是将凝汽器循环水并联运行改为串联方式。
3
The paper introduces the large system decomposition coordination theory, establishes the reservoir flood control optimization operation model of series and parallel connection reservoirs group.