For the use of fire alarm system, fire detector alarm unit testing and installation of construction engineering units during the installation and acceptance of the tools is necessary.

为各使用火灾报警系统的单位测试火灾探测器报警功能及安装施工工程单位安装验收过程中必备之工具。

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Accumulator charging valve is key unit used in hydraulic braking system of engineering machinery and rubber tyred equipments for mines.

蓄能器充液阀是一种用于工程机械及矿山无轨设备制动液压系统的关键液压元件。

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Electric % system is a very important unit, which is used in the field of electric engineering and mechatronics engineering.

电子系统是电子工程，机电工程领域涉及的一个重要部分。

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