作为建筑物顶部四周标志或信号报警之用。
Used as marking or signal alarming for building top or surround.
针对鸿村道口这一特殊地段，对其信号报警系统进行了改造。
The reform of the signal warning system in Hongcun cross is introduced.
信号报警显示部分由零序电压检测、报警、显示等电路构成。
The latter makes use of zero sequence voltage detection, alarm and display circuit.
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