The " xin - 8 " transposltion system for open - wire telecommunication lines 电信明线新8式交叉制式
2.
The " xin - 4 " transposltion system for open - wire telecommunication lines 电信明线新4式交叉制式
3.
The mobile e - cert certificate is generally designed for use in the wireless internet or other mobile application other than wired telecommunication environment 流动电子核证证书是为使用无线互联网或有关应用而设计，这与固网通讯环境不同。
