net of lines

presents the method of making direct network cable and cross network cable,the sharing of network hardware and software resource and the using of network printer.

对直连网线和交叉网线的制作、网络软硬件资源的共享、网络打印机的使用作了详细的论述。

This paper describes the principle of th principle of the earth-leakage protection installation and its application to the D.

本文叙述了煤矿井下直流架线电网漏电保护的原理及应用。