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【多选题】
Consider a relation with schema R(A,B,C,D) and functional dependencies AB → C, D → A. Which of the following are superkeys of R? (This is a multiple choice question)A.
{B}
B.
{B,D}
C.
{A,B,D}
D.
{A,B,C,D}
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反馈参考答案：
举一反三
【单选题】一般情况下，导热系数的大小关系应为：
A.
金属固体>非金属固体>气体>液体
B.
非金属固体>金属固体>气体>液体
C.
金属固体>非金属固体>液体>气体
D.
非金属固体>金属固体>液体>气体
【单选题】The two sisters are different from each other in their _______. One likes music, but the other likes sports.
A.
grades
B.
characters
C.
shapes
D.
interests
【单选题】The two sisters are forced to play the piano. In fact,neither of them ______ to play it.
A.
like
B.
liked
C.
likes
D.
liking
【简答题】重视启发教学，提出“助产术”的人是苏格拉底。()
【单选题】The two sisters are _____ in many ways, not only in appearance but also in temperament.
A.
like
B.
likely
C.
alike
D.
lively
【单选题】一般情况下,导热系数的大小关系应为:
A.
金属固体>非金属固体>液体>气体
B.
金属固体>非金属固体>气体>液体
C.
非金属固体>金属固体>气体>液体
D.
非金属固体>金属固体>液体>气体
【单选题】The two sisters are very different in character. One is quiet but _______ is outgoing.
A.
another
B.
others
C.
the others
D.
the other
【单选题】The two sisters are so alike it’s difficult to _______one from the other.
A.
determine
B.
discriminate
C.
distinguish
D.
contrast
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