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【单选题】
在关系模式A(S,SN,D)和B(D,CN,NM)中,关系A的主键是S,关系B的主键是D,则属性D在关系A中称为A.
B.
外键
C.
主键
D.
候选键
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举一反三
【单选题】According to a study carried out by an American university, when you eat has ______ on your mood as ______ you eat.
A.
much of as an effect; what
B.
much of as an effect; which
C.
as much of an effect; what
D.
as much of an effect; which
【单选题】Has your sister succeeded_____ the first place at the university this term?
A.
for getting
B.
to get
C.
in getting
D.
in get
【单选题】--How ___ your daughter ___ at university? ---She’s doing fine. Thank you.
A.
is . getting along
B.
has, got along
C.
does, get along
D.
was, getting along
【简答题】The Student Union at your university has decided to organize a contest, calling for ideas to improve the outlook of the campus. Write an announcement to invite students to participate, giving informat...
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