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【单选题】
关系模式学生(学号,课程号,名次),若每一名学生每门课程有一定的名次,每门课程每一名次只有一名学生,则以下叙述中错误的是( )A.
（学号，课程号）和（课程号，名次）都可以作为候选键
B.
只有（学号，课程号）能作为候选键
C.
关系模式属于第三范式
D.
关系模式属于 BCNF
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举一反三
【简答题】Predict what will happen to interest rates on a corporation’s bonds if the federal government guarantees today that it will pay creditors if the corporation goes bankrupt in the future. What will happ...
【简答题】A．resolve B．determine C．settle D．conclude
【简答题】A．suppose B．assume C．withdraw D．conclude
【单选题】If the interest rates on all bonds rise from 5 to 6 percent over the course of the year, which bond would you prefer to have been holding?
A.
A bond with ten years to maturity
B.
A bond with one year to maturity
C.
A bond with five years to maturity
D.
A bond with twenty years to maturity
【简答题】Conclude 结束谈判
【单选题】If the interest rates on all bonds rise from 5 to 6 percent over the course of the year, which bond would you prefer to have been holding?
A.
a bond with one year to maturity
B.
a bond with five years to maturity
C.
a bond with ten years to maturity
D.
a bond with twenty years to maturity
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