Why did American city residents want to live in the suburbs after World War Ⅱ?
A. Because older American cities were dying.
B. Because they were richer and needed more space.
C. Because cities contained the wont pare of society.
D. Because they could hardly afford a live in the city.
第1题:
下列字符型常量Hello,world!表示方法中,错误的是______。
A.[Hello,world!]
B.'Hello,wOrld!'
C.Hello,world!,
D.{Hello,world!}
第2题:
关系模式CSZ(CITY,ST,ZIP)其属性组上的函数依赖集为F={(CITY,ST)→ZIP, P→CITY},关系模式CSZ的主属性是
A.ZIP
B.CITY,ST,ZIP
C.CITY,ZIP
D.ST,ZIP
第3题:
1、高效地组织会议,可以使用6W法,也是要妥善解决会议的
A.when(会议的时间)、where(会议的地点)
B.who(会议的成员)、what(会议的议题)
C.why(会议的目标)、how(会议的通知下发)
D.want(想要)、wait(等待)
第4题:
关系模式CSZ(CITY,ST,ZIP)其属性组上的函数依赖集为F={(CITY,ST)+ZIP, ZIP→CITY},关系模式CSZ的主属性是
A.ZIP
B.CITY,ST,ZIP
C.CITY,ZIP
D.ST,ZIP
第5题:
关系模式CSZ(CITY,ST,ZIP)其属性组上的函数依赖集为F={(CITY,ST)→ZIP,ZIP→CITY},关系模式CSZ的主属性是
A.ZIP
B.CITY,ST,ZIP
C.CITY,ZIP
D.ST,ZIP
第6题:
【单选题】下列哪个命令可以下载HDFS目录/user/root/live.txt
A.hdfs dfs -get /user/root/live.txt
B.hdfs dfs -download /user/root/live.txt
C.hdfs dfs -put /user/root/live.txt
D.hdfs dfs -move /user/root/live.txt