A solid and secured door frame is required for proper installation.

一个坚实和安全的门框需要正确安装。

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The second way is to choose a proper installation position of damper.

第二个途径是选择适当的止音毡安装位置。

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LEDs can last up to 50,000 hours, depending on how often they are turned on, proper installation and having the right power supply.

安瑞斯克说，根据LED的使用频率、正确的安装方式和适当的电源供给，LED的寿命通常为50000小时。

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Fraunhofer also will design a system to allow the solar energy equipment to check itself for proper installation and to send its power generation data to the local utility.

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The FAA says it will closely monitor modifications of the aircraft in the U.S. fleet in order to assure proper installation, and that it will stage teams of inspectors at the modification locations.

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Despite these issues, court challenges to the devices have largely been unsuccessful when proper disclosure of the devices installation is made.

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