The contractor shall set up all the necessary safety protectionsignal 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）
2
With the development of fiber optic cable technology, transmitting relay protectionsignal 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。
3
Data acquisition card collects data about the power output to realize a close-loop control, and protectionsignal of the two controllers to compute the delay time.