A、外部實(shí)體、數(shù)據(jù)處理、數(shù)據(jù)流和業(yè)務(wù)處理單元
B、外部實(shí)體、數(shù)據(jù)處理、數(shù)據(jù)流和數(shù)據(jù)存儲
C、外部實(shí)體、信息傳遞過程、數(shù)據(jù)流和業(yè)務(wù)處理功能描述
D、外部實(shí)體、數(shù)據(jù)處理、數(shù)據(jù)流和數(shù)據(jù)文件存檔