题目内容

1. I do not ______what you mean.2. Don’t______! Stay where you are.3. She has made him a______ cake for his birthday.4. At that time some people______children really badly; they did not even give them food sometimes.5. He was a ______ businessman; he just wanted money.

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2ASK、2FSK、2PSK、2DPSK中,2FSK可靠性最好。

A. 对
B. 错

2ASK、2FSK、2PSK、2DPSK中,2FSK有效性最好。

A. 对
B. 错

2PSK系统与2DPSK系统具有完全相同的误比特性能。

A. 对
B. 错

与2ASK相比,在相同的输入信噪比下,2FSK的误码性能要好。

A. 对
B. 错

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