ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

In order to measure the tree diameter at breast height (DBH) rapidly, efficiently and accurately, and improve the work efficiency of forest resource investigation, a portable high precision equipment for measuring tree DBH was developed. This equipment was integrated by central processing unit (CPU）, DBH sensor, liquid crystal display (LCD), storage, wireless communication module and so on. The DBH sensor was developed independently by this experiment. The principle of the DBH sensor was to convert the measured length information into voltage signal by using electronic technology and mechanical principle. The voltage signal would be calculated by CPU and the measured value of DBH was obtained. Wireless communication was used to cooperate with the mobile phone that installed with the data receiving terminal APP. It can achieve the functions of DBH measurement, data encoding, data recording, data editing, data storage and data export. According to the results of the test data, the measurement accuracy of this equipment for different tree species reached more than 99.97%. This device can adapt to different kinds of trees and different diameter trees, which accorded with the national survey accuracy standard of continuous forest inventory. And the measuring efficiency of this equipment was more than twice higher than that of traditional diameter gauge.