______ one time, Manchester was the home of the most productive cotton mills in the world.
A) On B) By
C) At D) Of
第1题:
A. mv /home/operator .
B. mv /home/operator/* .
C. mv /home/operator ../..
D. mv /home/operator/all ../home/operator
第2题:
( 11 )请在下列程序的空白处,填上适当的内容:
Import java. awt. *;
Import java. util. *;
Class BufferTest{
Public static void main(string args[])
Throws IOException{
FileOutputStream unbuf=
new FileOutputStream( “ test.one ” ) ;
BufferedOutputStream buf=
new 【 11 】 (new FileOutputStream( “ test.two ” ));
System.out.println
( “ write file unbuffered: ” + time(unbuf) + “ ms ” );
System.out.println
( “ write file buffered: ” + time(buf) + “ ms ” );
}
Static int time (OutputStream os)
Throws IOException{
Date then = new Date();
for (int i=0; i<50000; i++){
os.write(1);
}
}
os.close();
return(int)(()new Date()).getTime() - then.getTime());
}
第3题:
第4题:
A.etc/profile->$HOME/.cshrc->$HOME/.login
B.$HOME/.login->$HOME/.cshrc->etc/profile
C.etc/profile->$HOME/.login->$HOME/..cshrc
D.$HOME/.cshrc->etc/profile->$HOME/.login
第5题:
● 下面关于Manchester 编码的叙述中,错误的是 (14) 。
(14)
A.Manchester 编码是一种双相码
B.Manchester 编码提供了比特同步信息
C.Manchester 编码的效率为50%
D.Manchester 编码应用在高速以太网中
第6题:
1、用菜单导入数据的步骤是:
A.home - import data
B.home - open
C.home - new
D.home - new variable