Pause to ( ), like when you are asking a thought provoking question, making a strong statement,at punctuation -longer at footsteps, and shorter at comas.
【简答题】载波u C =5cos2π×10 8 t (V),调制信号u Ω (t)=cos2π×10 3 t (V), 最大频偏Δf m =20kHz 求:1.调频波表达式; 2. 调频系数m f 和有效带宽BW; 3. 若调制信号u Ω (t)=3cos2π×10 3 t (V),则m` f =? BW`=? (15分)