Tin plating as early as 1843 puts forward the first patent, and after 1930 have industrial practical.
电镀锡早在1843年就提出了第一个专利,1930年之后才具备工业实用性。
The first part puts forward for the problem, the existent key problem commenced from the current chemistry classroom teaching, elaborating important meaning of the effective teaching.
第一部分为问题的提出,从调查当前化学课堂有效教学存在的问题入手,阐述有效教学的重要意义。
Surround design reuse idea, the paper for the first time puts forward design reuse technology, enlarges reused range to product life-cycle design field.
围绕设计重用这一思想,首次提出设计重用技术,将重用的范围扩展到产品的广义设计领域。
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