tree scale

Many applications in multi-scale representation of spatial data from the model of treed ( R tree) are introduced. The model of multi-scale representation based on multi-scale R tree is put forward.

重点介绍了树状模型（R树）在空间数据多尺度表达中的应用，给出了基于多尺度R树的空间数据多尺度表达模型。

The Application of Equivalent Marking for Reducing the Scale of the Reachability Tree is Pr/ T Net System

等价标识在谓词/变迁网系统可达树规模缩减中的应用

Technique of Improvement on Large Scale Low yield Tung Tree Forest

大面积低产油桐林改良配套技术

Pitaya as an emerging industry of fruit trees, its large-scale commercial cultivation started a late. Compared to other fruit tree industry, research reports are few.

火龙果作为新兴的果树产业，其商业化和规模化栽培起步较晚，相比其它果树产业，研究报道较少。