在一个BCNF关系模式中,所有的非主属性对每一个码都是( )。
A.部分函数依赖
B.平凡函数依赖
C.传递函数依赖
D.完全函数依赖
参考答案:D
They voted for Mr Wilson as chairman of the union, for his talent and________had won the respect
of his workmates.[ ]
A. fortunate
B. quantity
C. quality
D. reaction
版面较深时,如线条版.实地版,要去的黏度(),而浅层版,特别是高光部分较多的版面,则需要的黏度()。
A.较高;较高
B.较低;较低
C.较低;较高
D.较高;较低