Diameter-class

基本解釋

In order to forecast accurately height of each diameter class of poplar in Jiangsu Province,the quadric parabola function with five parameters was established.
用江蘇省楊樹解析木編制了楊樹標準樹高曲線模型,該模型引入了適宜的林分控制因子(樹齡和地位指數(shù)),是具有統(tǒng)計學(xué)意義的樹高曲線模型。
Study on Estimation of Stand Diameter Class Volume and Merchant Volume
林分徑階蓄積量與材種出材量測算的研究
This lens can magnify 20 diameter.
這個透鏡能放大20倍。
Kindly send us two samples of each class quote for.
報價時，請對每一個等級的各寄兩個樣品。
The diameter of the tree-trunk is about 2 meters.
這樹干的直徑大約是2米。