某局域网中有1台打印服务器、3台客户机和2台打印机，其连接拓扑如图3-1所示。在该系统中，打印服务器根据某台客户机的请求，将数据在一台打印机上输出。设打印服务器、各客户机及各打印机的可用性分别为。a、b、c，则使用该系统打印文件的可用性为(11)。

图3-1　某局域网拓扑结构图

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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.

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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.

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In　C　language,(70)variables　have　to　be　defined　outside　of　any　function,　this(71)actual　storage　for　it.

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".