What are the famous Chinese e-book retrieval systems in China?

China Academic Journal Network Boshuo Papers Mirror VIP Chinese Journal Full-text Database Superstar Library Full-text Electronic Books National Journals Joint Catalogue Wanfang Data Resources System Foreign Language Database EBSCO Full-text Database OCLC Firstsearch Dutch KLUWER Full-text Database Springer Full-text Journal Database AGRICOLA Full-text Electronic Journals netLibrary E-books OVID Online Search Chemical Abstracts (CA).