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平台:
DOAJ Directory of Open Access Journals
(Available from 2000.)
EBSCOhost Academic Search Complete
(Available from 2000/01/01.)
EBSCOhost Energy & Power Source
(Available from 2000/01/01.)
EBSCOhost STM Source
(Available from 2000/01/01.)
ProQuest Agricultural & Environmental Science Database
(Available from 2000/12/01 until 2005/12/31. Available from 2007/01/01 until 2007/12/31. Available from 2009/01/01.)
ProQuest SciTech Premium Collection
(Available from 2000/12/01 until 2005/12/31. Available from 2007/01/01 until 2007/12/31. Available from 2009/01/01.)
PubMed Central Open Access
(Available from 2001 volume: 2.)
RSC Archive
(Available from 2000 volume: 1 issue: 1 until 2003 volume: 4 issue: 7.)
SpringerLink Open Access
(Available from 2000/12/01 volume: 1 issue: 1.)