一起答
单选

某些操作系统如图1所示,将一条命令的执行结果输出给下一条命令,作为其输入并加以处理,这是系统的(44)机制。使命令所需要的信息不从键盘接收,而取自另一个文件,这是系统的(45)机制。使命令的执行结果直接引向另一个文件,而不在屏幕上显示,这是系统的(46)机制。操作系统不从键盘逐条接收命令并执行,而调用一个正文文件,执行其中的一系列命令,这种方式称为(47)方式,编写这样的文件应符合(48)语言的语法规则。

  • A.链接
  • B.输出重定向
  • C.管道
  • D.输入重定向
参考答案
查看试卷详情
相关试题
  1. (99)

    • A.add
    • B.combination
    • C.difference
    • D.condition
  2. (98)

    • A.earlier
    • B.front
    • C.backward
    • D.later
  3. (96)

    • A.past
    • B.other
    • C.rest
    • D.host
  4. (97)

    • A.voice
    • B.mass
    • C.quantity
    • D.quality
  5. By using MP3, a 600M-byte music CD can be(70)to 50M bytes or less. It can be streamed(downloaded in chunks)so that you can begin listening to the opening bars while the(71)of the file arrives in the background. And, most important, MP3 music files retain good listening(72)that(73)compression schemes lacked. That(74)of features makes accessing and distributing music on the Web practical for the first time.

    • A.pressed
    • B.compressed
    • C.press
    • D.compress
  6. (94)

    • A.execute
    • B.interrupt
    • C.run
    • D.maintain
  7. The following suggestions increase program's(73)and make them easier to(74):

      Use a standard indention technique, blank lines, form. feeds, and spaces.

      Insert plenty of comments into your code.

    • A.security
    • B.reliability
    • C.readability
    • D.usability
  8. (92)

    • A.locates
    • B.allocates
    • C.looks for
    • D.finds
  9. In C language,(70)variables have to be defined outside of any function, this(71)actual storage for it.

    • A.internal
    • B.export
    • C.output
    • D.external
  10. when a string constant is written in C program, the eompiler creates(75)of characters containing the characters of the string, and terminating it with "\0".

    • A.a group
    • B.an array
    • C.a set
    • D.a series