Also preferred is, that the elements of a filter unit are coupled like a star.

同样优选的是，滤波器单元的元件被耦合为星形。

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Presents the operating principle of some critical components such as chilled water mixing station, fan filter unit and dry cooling coil.

介绍了冷水混合站、风机过滤器及干盘管等关键设备的运行原理。

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More preferably is, that the means for realizing are arranged as a filter unit, selected from the group comprising low-pass filter units, coupled to the IGBT-based switch.

更优选的是，该实现装置被设置为滤波器单元，其选自包括低通滤波器单元的组，并且耦合到基于IGBT的开关。

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Peter Thorne, PhD, professor of toxicology at the University of Iowa College of Public Health, recommends vacuuming floors at least once a week with a unit that has a highly efficient filter.

CNN: Give spring a healthier shine