China's two fixed-line operators, China Telecom and China Netcom, are suffering as consumers defect to mobile phones for local calls and to cheap internet-based services for long-distance calls.

Nokia, which makes almost four in ten of all the mobile phones sold worldwide, last week reported its first quarterly loss in more than a decade as its customers defect to the iPhone.

Then comes the introduction of the relative theories on the embedded mobile database (EMDB) and power line patrolling flow and the defect disposal method in detail.