A.萬(wàn)方數(shù)據(jù)庫(kù) B.CNKI數(shù)據(jù)庫(kù) C.重慶維普數(shù)據(jù)庫(kù) D.國(guó)研網(wǎng)數(shù)據(jù)庫(kù)