Closure operation of binary relation plays an important role in network, parsing and detection and diagnosis of malfunction in switch circuit.
二元关系的闭包运算在网络、语法分析以及开关电路中的故障检测和诊断等领域有着重要的作用。
With the progress of telecommunication technology, PSTN based on circuit switch technology is carrying out the transition to the Next Generation Network (NGN) increasingly.
随着电信技术的进步，基于电路交换技术的PSTN正逐步向下一代网络（NGN）过渡。
A novel high frequency switch power supply, which is suitable for power network outside, is introduced in this paper, and a automation switching circuit for 110V/220V input voltage has been designed.
介绍了一种适用于户外电网远程监测监控的不间断高频开关电源，设计了一种简易可靠的110V/2 2 0V自动切换电路，以满足宽范围电压输入要求。
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