The basic criterion of measuring the economic effects is the net income per unit area.
衡量农业技术的经济效果的基本指标，应该是单位面积的纯收入。
This article presents the define of the binary tree coordinate net and its basic theorems.
给出二叉树坐标网的定义及其基本定理。
This article presents the define of the binary tree coordinate net and its basic theorems.
二叉树平面坐标网、平面坐标网二叉树的定义及其基本定理在本文给出。
This article presents the define of the binary tree coordinate net and its basic theorems.
二叉树平面坐标网、平面坐标网二叉树的定义及其基本定理在本文给出。
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