问题
判断题
对于干扰通道,则时间常数越大越好,这样干扰的影响和缓,控制就容易。
答案
参考答案:对
对于干扰通道,则时间常数越大越好,这样干扰的影响和缓,控制就容易。
参考答案:对
What makes the world become smaller? Some inventions, It began in the 11th century, But it has developed greatly in the last century. Let’s take a look at the five top inventions. Movable Type(活字印刷) :By using Movable Type, books could be printed cheaply and easily. Bi Sheng invented Movable Type in China in the 11th century. Telephone: The inventor Alexander Graham Bell made the first telephone call in 1876." Mr. Watson, come here. I want you ,"he said to his assistant(助手) over the phone line. And with those famous words, the world was about to get much smaller. Airplane: The Wright brothers made the first powered flight in1903.Air travel has made the far way places suddenly become a lot closer. Satellites: The Soviet Union sent up the world’s first satellite in 1957. This begin the Space Age. Satellites have helped scientists study the earth. Much of our knowledge of the world has come from the information recorded by satellites. Internet: When the Internet was created in 1969. only a few people knew about it. But more than 650 million people in the world use it now. The Internet has made information about anything easy to get.
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