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.
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。
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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.