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【单选题】
下面关于操作系统的叙述中,( )是错误的.A.
操作系统是一种系统软件
B.
操作系统是人机之间的接口
C.
操作系统是数据库系统的子系统
D.
不安装操作系统的PC机是无法使用的
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举一反三
【简答题】Through the military life experience of Guy, and disillusionment of his dream of elimination of the evils through just wars, Evelyn Waugh explores in his work, ______, the nature of war.
【单选题】It was a pity that he __ blind, but to the joy of his family, his dream of becoming a musician _____ true at last.
A.
came; came
B.
went; went
C.
came; went
D.
went; came
【单选题】Ryan,with the help of others, is fulfilling his dream of help African peopleto____________
A.
make new materials
B.
preserve wetland and animals
C.
have clean air
D.
have clean water
E.
collect cigarette butts
F.
collect disposed oil
【单选题】设事件A，B，C两两独立，则事件A，B，C相互独立的充要条件是( )．
A.
A与BC相互独立
B.
AB与A+C相互独立
C.
AB与AC相互独立
D.
A q—B与A+C相互独立．
【单选题】设事件A,B,C 两两相互独立,则A,B,C 相互独立的充分必要条件是( )
A.
A 与BC 独立
B.
AB 与A +C 独立
C.
AB 与AC 独立
D.
A +B 与A +C 独立
【单选题】设事件A，B，C两两独立，则事件A，B，C相互独立的充要条件是( )．
A.
A与BC相互独立
B.
AB与A+C相互独立
C.
AB与AC相互独立
D.
A+B与A+C相互独立．
【单选题】他相信自己想当证券经纪人的梦想总有一天会实现。
A.
He believes that a day his dream of becoming a stockbroker will come out.
B.
He trusts that one day his dream of being a stockbroker will come.
C.
He believes that one day our dreams of becoming a banker will come true.
D.
He believes that one day his dream of becoming a stockbroker will come true.
相关题目：
【单选题】设事件A,B,C 两两相互独立,则A,B,C 相互独立的充分必要条件是( )
A.
A 与BC 独立
B.
AB 与A +C 独立
C.
AB 与AC 独立
D.
A +B 与A +C 独立