---Kittyhowwasyourweekend?---IhadagreattimeIwentskiingwithmyfriends.---Wow!A.Soundsreallycool!B.Cheers!C
--- Kitty how was your weekend?
--- I had a great time I went skiing with my friends.
--- Wow!
A . Sounds really cool! B . Cheers!
C . How interesting you are! D . I’ll go there too.
A
● 给定关系模式R ( U,F) ,U = {A,B,C,D }, F={A→C,A→D,C→B,B 2020-05-26 …
●给定关系模式R<U,F>,U= {A,B,C},F={AB→C,C→B}。关系R(55),且分别有 2020-05-26 …
●给定关系模式R<U,F>,U={A,B,C),F={AB→C,C→B)。关系R _(44) 且分别 2020-05-26 …
●给定关系模式R<U,F>,U={A,B,C),F={AB→C,C→B)。关系R (44) 且分别有 2020-05-26 …
给定关系模式R(U,F),U={A.B,C,D,E,H},函数依赖集F={A→B,A→C,C→D,A 2020-05-26 …
给定关系模式R(U,F),U={A,B,C,D},F={A→C,A→D,C→B,B→D),F中的冗余 2020-05-26 …
数据库模式分解请给出答案及其分析过程!给定关系模式R(U,F),其中,属性集U={A,B,C,D, 2020-07-10 …
排列成正确的句子:me,I,go,excuse,haveto.排列成正确的单词:1.c,d,e,s, 2020-11-01 …
以DNA的一条链“…-A-T-C-…”为模板,经转录以后形成的mRNA是()A.…-T-A-G-…B 2020-12-14 …
以DNA的一条链“…—A—T—C—…”为模板,经复制后的子链是[]A.…T—A—G—…B.…—U—A 2020-12-18 …