物联网关键技术及问题研究 这是一篇关于物联网的文章 很有用 阅读后请删除 不要做任何商业活动-Key technologies and issues of things this is a research article on useful things to read after you remove the do not do any commercial activity

制备高性能低辐射玻璃的文档介绍，已经上交过老师评阅。-The document describes of the preparation of high-performance low-emissivity glass has been turned over to the teacher reviewers.