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【单选题】
A disadvantage of highly structured interviews is that
A.
the possible answers are limited.
B.
there is an opportunity to follow up with secondary questions on topics that turn out to be interesting to the interviewee.
C.
it’s easy to get sidetracked and go off on tangents.
D.
it takes more training to conduct highly structured interviews than any other form of interview.
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【多选题】在关系数据库理论中,专门的关系运算包括( )。
A.
笛卡尔积
B.
投影
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连接
D.
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A.
adjacent
B.
gigantic
C.
perilous
D.
imminent
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A.
confuses
B.
regards
C.
strikes
D.
knocks
【多选题】在关系数据库理论中,专门的关系运算包括()。
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选择
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投影
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连接
D.
交叉
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【多选题】在关系数据库理论中,专门的关系运算包括()
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并运算
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选择运算
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差运算
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连接运算
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A.
The authenticity principle
B.
The form-function principle
C.
The task independency principle
D.
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【多选题】在数据库理论中,专门的关系运算包括( )。
A.
投影
B.
交叉
C.
连接
D.
选择
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