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2、万方数据知识服务平台: http://www.wanfangdata.com.cn/
3、百度学术搜索:http://xueshu.baidu.com/
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5、豆丁网 https://www.docin.com/
springer link : https://link.springer.com/
https://www.sciencedirect.com/
:https://onlinelibrary.wiley.com/
web of knowledge : http://www.webofknowledge.com/
https://www.engineeringvillage.com/home.url
Your gateway to world-class research journals :https://journals.sagepub.com/