Basic knowledge of polyethylene material, pipe fittings specifications, pipeline construction specifications, technical points, management experience and design parameters.

聚乙烯材料基础知识、管材管件规格、管道的施工规范、技术要点、管理经验及设计参数。

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And content in the next we introduce the basic knowledge of OTFTs, including common device structures, OTFTs works, material selection and preparation, and crafts.

并在接下来的内容里介绍了OTFT的基本知识，包括常见的器件结构、OTFT的工作原理、材料选择和制备工艺等。

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Vocabulary, as one of the three essential components that constitute language knowledge, is the basic building material of all languages.

词汇作为语言的三大要素之一，是语言的基本建筑材料。

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