中国科学院
是一个集科研信息发布、学术交流、科普教育于一体的综合性平台
Open Access Library (www.oalib.com) is an academic search engine and publisher. You can download research papers for free and submit your paper to it. It is a shared academic database.
OALib学术文章搜索官网:https://www.oalib.com/