B.) occasion
C.) case
D.) situation
[单选题]A. caseB. shortC. turnD. essence
[单选题][A] case [B] example [C] lesson [D] suggestion
[单选题]A.) in caseB.) rather thanC.) as well asD.) as though
关系R和S如下图所示,试计算R÷S中有几个元组[1]。 R A B C D a b c d a b e f a b h k b d e f S C D c d
[试题]circumstance
Students should be able to extend the logic of each to their particular circumst
[单选题]在关系模式S(A,B,C,D)中,F={A→(B,C,D),C→D},则R最高达到______。A.) 1NFB.) 2NFC.) 3NFD.) BCNFA.B.C.D.
[单选题][A]figures [B]exhibits [C]convinces [D]speculates
[单选题]A. binding B convincing C restraining D sustaining
[单选题]7.— ________ .is your pencil case?—It’s blue and white.A. HowB. What colorC.WhatD. When