题目内容
---I have never been to Beijing.---______ have I.
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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.
2ASK、2FSK、2PSK、2DPSK中，2FSK可靠性最好。
2ASK、2FSK、2PSK、2DPSK中，2FSK有效性最好。
2PSK系统与2DPSK系统具有完全相同的误比特性能。
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