This paper analysis the reason why the middleerror of unit weight in first class traverse of Nan Tong City (B area) is bigger with the principle of mathematic statistics;
本文运用数理统计学原理分析了南通市一级导线网（B区）单位权中误差偏大的原因；
2
If the message string sent by the client contains "error," the full message string will be printed in big red letters in the middle of screen.
如果客户机发送的消息字符串包含“error”，则屏幕中央将以放大的红色字体显示完整的消息字符串。
3
We analyze the error reasons of inferring inside block of amperemeter in the middle divisor as well as bring forward betterment measure.