问题
判断题
数字调制信号，在二进制时有振幅键控、移频键控、移相键控。其中振幅键控属于非线性而移频键控属于线性调制。
答案
参考答案：错
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数字调制信号，在二进制时有振幅键控、移频键控、移相键控。其中振幅键控属于非线性而移频键控属于线性调制。
参考答案：错
选择短语完成句子。
1. I can't hear the radio clearly. Please _____ it _____ . 2. You look so tired, don't _____ _____ to night. You should go to bed now. 3. Tom is unhappy now. Let's _____ him _____. 4. We should give it to teachers if we _____ _____ something in the street. |
