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【单选题】A ( ) is a set of attributes in a referencing relation, such that for each tuple in the referencing relation, the values of the foreign key attributes are guaranteed to occur as the primary key valu...
A.
superkey
B.
candidate key
C.
primary key
D.
foreign key
【多选题】下列描述中,属于马斯洛需要层次理论的有( )。
A.
在激励中，保健因素必不可少
B.
人的需要按照重要性和发生顺序可以分为生理、安全、归属、尊重和自我实现的需要
C.
只有较低层次的需要满足之后才会产生较高层次的需要
D.
领导者的激励应侧重主导需要
E.
能够使人产生满足感的是双因素中的激励因素
【简答题】Choose a defi nition for each key term
【单选题】In the first test, each subject sat before a computer screen and pressed a key as soon as he or she recognized a target letter among a grouping of 96. In this simple test, smokers, deprived smokers an...
A.
to test whether smoking has a positive effect on the mental capacity of smokers
B.
to show how smoking damages people's mental capacity
C.
to prove that smoking affects people's regular performance
D.
to find out whether smoking helps people's short-term memory
【简答题】含有天然蜂蜜60%,人造蜜40%的混合蜜_____________。
【简答题】当SOP为真时,S与P的外延关系不可能有( ) A .全同关系 B.真包含于关系 C.真包含关系 D.交叉关系 E.全异关系A.B.C.D.E. E
【单选题】Each of the students, working hard at his lessons,__________to go to key universities.
A.
hope
B.
hopes
C.
hoping
D.
hoped
【单选题】How is finding a birth mother like getting a key to a diary?
A.
A diary comes with each birth certificate.
B.
The adoptees will have a chance to find out about their mother's life.
C.
If the key opens the diary, you get a birth certificate.
D.
The adoptee will have to keep a diary before they get a birth certificate.
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