题型:名词解释 — Everything for the project has been progressing smoothly so far.--- ____ that you’ll complete it on time.A.No wonderB.No doubtC.No needD.No worry 查看答案
题型:名词解释 设关系模式R(A,B,C),下列结论错误的是 (23) 。A.若A→B,B→C, 则A→CB.若A→B,A→C,则A→BCC.若BC→A,则B→A,C→AD.若B→A,C→A,则BC→A 查看答案