With telecommunication competition aggravating, long-distance business account-billing system has become mainpoint of long-distance service of China Unicom.

Techniques of farming trouts,Salmo gairdnerii & Salmo aguabonita Jordan,in seawater and some others concerned are analysed and discussed based on studies of long-distance transportation,domestication and farming of trouts at sea.

In this paper,the living habits and characteristics,living environment and the condition for long-distance transportation of cold-water fish living in the east of Xizang are studied.

Emergency nursing of patients by long-distance trans-hospital treatment in first aid;