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2-2-8 )电路如图 2.14 所示,已知U=6V , 与 消耗功率之比为 1/2 ,则电阻 值 与 之比为 。
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【多选题】设闭环离散系统如图所示，其中采样周期为【图片】。【图片】则下列说法正确的是（）
A.
作用下的稳态误差为
B.
作用下的稳态误差为
C.
作用下的稳态误差为
D.
作用下的稳态误差为
【判断题】10 different message signals, each with a bandwidth of 20 kHz, are to be multiplexed and transmitted. If the multiplexing and modulation methods are frequency-division multiplexing (FDM) and double si...
A.
正确
B.
错误
【简答题】缺词填空 根据短文内容及首字母提示，补全空格内单词，使短文完整、通顺。（共10小题；每小题1分，满分10分） Are you able to send a letter with pictures and sounds to someone anywhere in the world without putting a stamp on it? W 小题1: e-mails you can do ...
【简答题】任务型阅读(10’):每空填一词。 Nowadays people use different ways to communicate with each other. And does one always tell the truth when he or she talks with the other on the phone? Or does one sometimes tell a l...
【简答题】阅读理解。 David's got a text message from his friend Sam. Can you understand it? 7,15 20,15 20,8,5 16,1,18,11 This message was in code (密码, 代码). How many letters are there in the English al...
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