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The purpose of this study was to investigate the developmental characteristics in the early fraction of 3-6 year old kids,including the sub-section,amount ratio (comparison on the units),equivalence,and computing.

本研究的目的是考查3-6岁儿童早期分数概念的发展状况和年龄特点,其中包括等分、量比(单位量的比较)、等值、运算的发展状况和年龄特点。

Research on the key technology of equal dividing and positioning for rotation table;

旋转工作台快速精确等分定位方法的研究

Aiming at arbitrary curve route, the technology and theory in practical requirements of equal dividing and positioning were studied.

针对任意实际路程,研究了等分和定位诸多实际需要的技术和理论,阐述了以等分为手段,以定位为目的的等分定位概念。