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【单选题】
多用户的数据库系统的目标之一是使它的每一个用户好像面对一个单用户的数据库一样使用它，因此数据库系统必须进行______。A.
并发控制
B.
完整性控制
C.
安全性控制
D.
可靠性控制
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举一反三
【简答题】____________ is the basic social organization of a society.
【单选题】Which of the following is not mentioned as a reason for the multi-gen home?
A.
Transport.
B.
Health care.
C.
Economics.
【单选题】. A new technique ____, the production as a whole increased by % percent last year.
A.
employing
B.
having employed
C.
to have been employed
D.
having been employed
【单选题】Which is not one of the eight trigrams?( )
A.
The xun trigram
B.
The qian trigram
C.
The gen trigram
D.
The gun trigram
【简答题】在革命战争时期,青年一代满怀( )理想,为争取民族独立、人民解放冲锋陷阵、抛洒热血
【单选题】Everything on the news ________ a whole new meaning when you have a personal connection with the people.
A.
takes up
B.
takes on
C.
takes away
D.
takes off
【单选题】The basic social organization of a society is its
A.
culture
B.
social strata
C.
social structure
D.
caste system
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