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anywhere anyway anytime anything anyone1. You can come .2. , that’s enough about my problems. How about you?3. Is there that belongs to you?4. His article is better than else’s in the class.5. I’m not going ___ tonight.

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基本的带通调制方法有、和。

非对称数字用户线路的英文缩写是。

将发送端的数字信号变换成模拟信号的过程称为 ,而将接收端的模拟信号还原成数字信号的过程称为。

根据信号中参数的取值方式,通常将信号分为信号和信号。