The contractor shall set up all the necessary safety protection signal devices on the construction site, including (but not limited to)

承包商应在施工工程区内设置一切必要的安全防护信号装置，这些信号装置包括（但不限于）

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With the development of fiber optic cable technology, transmitting relay protection signal through optic cable are getting more and more popular.

随着光纤技术的迅猛发展，利用光纤传输继电保护信号，已获得了业内人士的普遍欢迎。

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Data acquisition card collects data about the power output to realize a close-loop control, and protection signal of the two controllers to compute the delay time.

数据采集卡采集程控电源的输出以实现对程控电源的闭环控制，采集发电机控制器和汇流条功率控制器的保护信号以计算延时时间。

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America is planning to improve its satellite-navigation system further: next year, it will start launching a second generation of GPS satellites, which will offer greater accuracy for civilian users and, for military purposes, greater protection against the signal being jammed by an enemy.

ECONOMIST: Space race | The