Four elements which belong to system of mathematics knowledge are analyzed; some unilateral influences of mathematics teaching material which is using on mathematics education are pointed out.
分析了数学知识系统应具有的四要素，指出了现行数学教科书对数学教育的一些片面影响。
Finally, according to the knowledge of the motor, derives out the mathematics model of the linear motor. On this basis, designs the electromagnetic lifting system with PLC.
最后，根据电机学的知识，推导出了直线电机的数学模型，并在此基础上，设计了采用PLC控制的电磁举升系统的控制部分。
The knowledge system of mathematics has a few different kinds of structure, logic structure, cognitive structure, structure of teaching materials and teaching structure.
数学知识系统有几种不同的组织结构：逻辑结构、认知结构、教材结构和教学结构，并且都有多种具体表现形式。
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