题目内容
(请给出正确答案)
[主观题]
__________ can help but admit that drastic changes have taken place in China since the eco
nomic reform. 20years ago.
A. Everybody
B. Someone
C. Anybody
D. Nobody
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A. Everybody
B. Someone
C. Anybody
D. Nobody
第8题
测得某电台发射的信号 us=10(1+0.2cos2513t)cos37.7×106t(mV) 问此电台的频率等于多少kHz?调制信号的角频率等于多少rad/s?信号带宽等于多少Hz?总边带功率相对于总功率是多少分贝?
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