题目4单选题
<img src="https://p.ananas.chaoxing.com/star3/origin/3f0307755647d6abfff4dff9f3f9e989.png">该放大电路的电压放大倍数为( )A. <img src="https://p.ananas.chaoxing.com/star3/origin/8c13be74b79fa8eaff11510d6bc5d726.png">B. <img src="https://p.ananas.chaoxing.com/star3/origin/cc0b2861ddd5e4217df4778dca1ef841.png">C. <img src="https://p.ananas.chaoxing.com/star3/origin/2b3c0b8403fe07197381b0c2f651fc78.png">