金属材料试样在拉伸试验时，被拉断截面所承受的最大应力，称为（）。它表示金属材料在拉力

阅读下面短文，将短文中画线部分的句子翻译成中文，并将其答案写在答题卡的相应位置上。
We are all busy talking about and using the Internet. But how many of us know the history of the Internet?
At first the Internet was only used by the government . 112. But in the early 1970’s , universities, hospitals and banks are allowed to use it , too . However, computers were still very expensive and the Internet was difficult to use. By the start of the 1990’s, computers became cheaper and easier to use. Scientists had also developed software that made “surfing” the Internet more convenient.
113Today it is easy to use the Internet and sending e-mail is more and more popular among students.
      The Internet has now become one of the most important parts of people’s life.

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