【简答题】小孔成像 上下颠倒, 那么小孔成像中所成的像左右颠倒吗?
【判断题】双频FSK系统中包括非相干的FSK和相干的FSK。
【判断题】Each B cell only expresses a single type of receptor to recognize a single type of antigen
【判断题】恋爱失败就等于生活结束,就等于生活的失败。
【单选题】_________ is the only phase of DNA replication that is known to be regulated, and it is regulated such that replication occurs only once in each cell cycle.
【单选题】恋爱失败就等于生活结束,就等于生活的失败。
【判断题】FSK信号有连续相位的FSK和相位间断的FSK,相位间断FSK信号的带宽要小于连续相位FSK信号的带宽。
【简答题】八进制相位不连续FSK信号的信息速率为f b ,当相邻功率谱主瓣刚好不重叠时,8FSK信号的带宽B 8FSK =______,频带利用率r 8FSK =______,频带利用率是8ASK的______倍。