A.數(shù)據(jù)元素>數(shù)據(jù)項(xiàng) B.數(shù)據(jù)元素<數(shù)據(jù)項(xiàng) C.數(shù)據(jù)項(xiàng)>數(shù)據(jù)元素 D.都不對(duì)