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【简答题】
True (T) or False (F)? 1. The writer thought that the likelihood of him getting the job was not great though he was young and eager to do something useful. 2. The headmaster liked the young man at first sight. 3. The headmaster saw eye to eye with the writer as far as children’s games were concerned. 4. The writer was not happy about his having to teach algebra and geometry, but he did not mind having to walk a mile along the dusty road to the Park. 5. The young man was satisfied with the salary he would get. 6. The writer did not feel unhappy at the idea of working under the headmaster’s wife.
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【简答题】请查找8位编码:飞轮(自行车用)
【简答题】载波频率为25MHz，振幅为4V，调制信号频率为400Hz的单频正弦波，最大频偏Δf=10kHz，试分别写出调频波表达式u FM （t）=（），调相波表达式u PM （t）=（）。
【简答题】调频波的表达式为: u FM ( t ) = 10cos[2 π× 10 7 t + 10cos200 π t] V ;调频波的幅度 为 V ,调频指数 m f 为 ,载波 f c 为 MHz ,带宽为 Hz 。