问题
判断题
数据链路与物理链路的区别在于数据链路除物理链路外，还必须有一些必要的规程来控制数据的传输。因此，数据链路比物理链路多了实现通信规程所需要的硬件和软件。
答案
参考答案：对
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数据链路与物理链路的区别在于数据链路除物理链路外，还必须有一些必要的规程来控制数据的传输。因此，数据链路比物理链路多了实现通信规程所需要的硬件和软件。
参考答案：对
 Look at the paper in the picture carefully. Is there anything different from your notebook paper? This kind of paper feels as soft as your notebook paper. It’s also easy to write on. But do you know, this kind of paper is made from stone?As we know, stone is easy to get on the earth, so it’s cheap. And the stone paper is about 20% to 30% cheaper than ordinary paper. The stone paper causes little pollution and helps protect the environment, because it makes tree and water free. The following table shows what is needed to make one ton of stone paper and one ton of ordinary paper.
Now in Beijing, some students begin to use stone paper to do their homework. And during the two sessions (两会) in 2011, stone paper was also used. 小题1:Stone paper is ______________.
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