更多"Suppose we have the relation schema"的相关试题:
[单项选择]Suppose we have the relation schema R(A,B,C,D) with functional dependencies ;F{A→ B,B→C,C→D,D→A},then R(A,B,C,D) at least is in
A. 1NF
B. 2NF
C. 3NF
D. BCNF
[单项选择]We'l arrive this evening if we don't have any（）with this car.
A. trouble
B. matter
C. question
[单项选择]We have planned an exciting publicity ________ with our advertisers.
A. struggle
B. campaign
C. battle
D. conflict
[单项选择]No matter how little money we have, we should get into the habit of ______ some in the bank regularly.
A. laying
B. withdrawing
C. putting
D. depositing
[单项选择]Data from Voyager Ⅱ have presented astronomers with a {{U}}puzzle{{/U}} about why our outermost planet exists.
A. problem
B. mystery
C. question
D. point
[单项选择]______ difficulties we may have, we must finish the task as required.
A. Whatever
B. Whichever
C. Of which
D. No matter how
[单项选择]In recent years, railroads have been combining with each other, merging into super-systems, causing ______ concerns about monopoly.
A. enhanced
B. curbed
C. disrupted
D. heightened
[单项选择]For those who have hearing problems telephones with volume controls provide the best ______.
A. result
B. reply
C. response
D. solution
[单项选择]Some companies have introduced （） working time with less emphasis on pressure and more on efficiency.
A. rigid
B. limited
C. flexible
D. strict
[单项选择]From the passage, we know if we have failed, we should ______.
A. not think about it any more
B. be very happy
C. learn from others
D. learn to accept
[单项选择]We will do anything we can ______ you catch up with the others.
A. help
B. to help
C. helping
D. helped
[单项选择]We have done all we could and now our cherished project is at the mercy of our new CEO.
A. under the guidance of
B. in the power of
C. on the verge of
D. on the agenda of
[单项选择]At last, we found ourselves in a pleasant park with trees providing shade and（） down to eat our picnic lunch.
A. having sat
B. sitting
C. to sit
D. sat
