This paper first introduces the fundamental knowledge of Electromagnetic valve, such as theory and structure, and introduces the Features of Electromagnetic valve.
本文首先介绍了电磁换向阀的原理、结构等一些基本知识，并且简要概括了电磁换向阀的特点。
That is why practice is the criterion of truth and why "the standpoint of life, of practice, should be first and fundamental in the theory of knowledge".
所谓实践是真理的标准，所谓“生活、实践底观点，应该是认识论底首先的和基本的观点”，理由就在这个地方。
A researched study on two of art's most fundamental themes, Color and Lightbridges the gap between abstract theory and practical knowledge.
一个关于艺术的最根本的主题，颜色和光线之间的桥梁抽象的理论和实践知识的差距两个研究研究。
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