二极管检波电路如图题6.5所示。调制信号频率F的范围是10 2 ~10 4 Hz,C 1 =0.01uF,C 2 =10uF,R=5.6kΩ,R L =12kΩ,二极管VD的导通等效电阻r d =80Ω,设二极管VD的导通电压U bz =0。试问: (1)不产生惰性失真的条件下,m a 的最大值应为多少? (2)不产生负峰切割失真的条件下,m a 的最大值应为多少? (3)不产生惰性失真和负峰切割失真的条件下,m a 应为多少?
【简答题】听下面一段对话, 回答第1-2题。 1. Where are the two speakers? A. In a classroom. B. In a bank. C. In a shop. 2. What does the woman want to do? A. To change a sweater. B. To borrow a sweater. C. To wash a sweater.