（视频2.5.3测试题）http://image.zhihuishu.com/testzhs/onlineexam/ueditor/201508/9c65e4093d8944a986b5248bf5b2030c.jpg

<span style="font-size: 18px;（视频2.5.3测试题）</span>http://image.zhihuishu.com/testzhs/onlineexam/ueditor/201508/9c65e4093d8944a986b5248bf5b2030c.jpg

<span style="font-size: 18px;<strong>（视频2.5.3测试题）&nbsp; </strong></span>http://image.zhihuishu.com/testzhs/onlineexam/ueditor/201508/1eed344f73734839a8884b6872db4654.jpg

2.5.3 晶体管单管放大三种接法的放大电路中，输出电阻最小的是 放大电路。 A: 共基 B: 共集 C: 共射