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。

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The utilized method was to transform the parallel operation 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。

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The paper introduces the large system decomposition coordination theory, establishes the reservoir flood control optimization operation model of series and parallel connection reservoirs group.

文章介绍了大系统分解协调理论，建立了串联、并联库群水库防洪优化调度模型。

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