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【单选题】
以下关于物联网网络层基本概念的描述中错误的是 ( ) 。A.
物联网的 “ 网络层 ” 也称为 “ 网络传输层 ”
B.
网络层连接感知层与应用层
C.
物联网网络层要正确、快速传输感知层的数据与控制指令
D.
物联网网络层要保证数据传输的安全性
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【简答题】阅读理解。 Television in the United States is free. To pay for programs, there are many advertisements. Often these advertisements are short plays with actors. The following television advertisement is lik...
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【单选题】Why is it difficult to learn names all over the world?
A.
There are many names all over the world.
B.
The names in different countries are different.
C.
Some names are very long, and some are very short.
D.
Some people have nicknames.
【简答题】Do you know there are many kinds of grass? Some are tall. The kind that grows around your house is short grass. But field grass often grows as tall as a man. Some food that we eat comes from plants of...
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