公用信号 
global semaphore
- 参考地,通常是指潜在的参考端,有时被称为回路或公用信号。
Reference ground, sometimes called a return path or signal common, is usually the reference potential of interest. - 数据传输装置基于传真机的原理,利用公用电话网络,实现数据信号的远程传输。
The data-transmitting agency based on the principle of fax realizes long-distance data transmitting by the public phone net. - 通讯采用直流电源载波方法,信号线与电源线公用,不仅降低了布线成本,而且提高了系统可靠性。
Using the DC power carrier technology, the signal was modulated into the power wire, which can not only reduce the wiring cost, but also improve the system reliability.
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