The conceptual modeling elements and mutual relations between them are discussed and some key technical problems are identified in the development of feature based temporal - spatial data models.
讨论了基于特征的概念模型要素及相互关系；提出了基于特征的时空数据模型所面临的关键技术。
Some key technical problems have been amended, for example, leakage of hydraulic pressure bursa, control of drainage, analysis of apparatus system error, design of accessorial equipments, and so on.
解决了该仪器系统存在的几个关键技术问题，如液压囊漏水问题、排水控制问题、仪器系统误差分析、附属设备的设计等。
This paper systematically introduces some typical no-tank processes, analyzes their key technical problems, and puts forward ways to solve them.
本文较系统地介绍了一些典型的无罐流程，并对其技术关键问题进行了分析，提出了解决措施。
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