This paper discusses how to establish multilayer storage structure and automatically reduce small scale graph from large scale mapping database by theory of changed-focuses Datum Model.
作者通过变焦数据模型原理,探讨如何建立多层存贮结构,将数字地图中的大比例尺地图数据库自动导出小比例尺图形。
In this paper, by the model test, authors study some design of support structure system with three-lane road tunnel of small-scale and high-span.
本文针对高跨比较小的三车道公路隧道,结合某工程设计的支护结构体系进行了模型试验研究,并进行了必要的有限元计算分析。
Model test is one of the important means for evaluating structure performance. Currently, there are only a few researches about design method of small-scale cable-stayed bridge.
模型试验是测定结构性能进行科学研究的重要手段之一,目前关于斜拉桥模型设计方法的系统研究还很少。
The utility model has simple structure, small volume, low cost and is easy to be used and can be produced in large scale.
本实用新型结构简单,体积小,使用方便,并且成本低,可批量生产。
The utility model has simple structure, small volume, low cost and is easy to be used and can be produced in large scale.
本实用新型结构简单,体积小,使用方便,并且成本低,可批量生产。
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