In the light of using top down method in the design of product with CAD, a method of feature design, which chooses proper shape feature as the datum for next design step, is presented.
针对自上而下的计算机辅助机械产品图形设计，提出了适应这种设计思维的特征设计方法，即选择合适的形状特征，作为进一步的详细设计的基准。
The close combination of word order, semantic feature and diachronic language datum of individual sentence pattern is an attempt to explain the phenomenon.
语序与语义特征及个别句式历时材料的有机结合是诠释这一现象的一种尝试。
This paper offers a method of modeling and simulating for digital controlled power supply system, on the basis of analyzing the feature of how datum are processed in digital processor.
文中在分析数字处理器的工作特点的基础上，提出一种适合于数字控制电源系统的建模仿真方法。
It introduces the perspective system feature in different positions between tableau and datum plane inclination.
研究了画面与基面处于不同位置时的透视体系特征。
It introduces the perspective system feature in different positions between tableau and datum plane inclination.
研究了画面与基面处于不同位置时的透视体系特征。
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