如果您在企业环境中运行AIX，系统上很可能已经安装了这三种应用程序，不需要额外的管理和维护工作。

And if you are running AIX in your enterprise setup, it is highly likely that these three applications are installed on your AIX system and are already being managed and maintained.

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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。

The parallel blade damper is the ZD series damper. These dampers have been designed to provide long life, silent operation and require zero maintenance.

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