Active role education has been hot in educational theory research in recent years, but in practice students' active role position and its value have never been put into full play.

主体性教育是近年来教育理论界研究的一个热点，但实际教学实践中学生的主体地位和主体价值却未得到充分体现。

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This paper generally describes the fire control system's basic concept, classification, role, position, component, function and work principle;

概述了火控系统的基本概念、分类、作用、地位、组成、功能及工作原理；

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This paper generally describes the fire control system's basic concept, classification, role, position, component, function and work principle;

概述了火控系统的基本概念、分类、作用、地位、组成、功能及工作原理；

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