在如图所示放大电路中,已知 V CC =12V ,β =50 , R b1 =60K Ω, R b2 =20K Ω, R C =4K Ω, R e1 =100 Ω, R e2 =2.2K Ω, R L =4K Ω,则电压放大倍数 A u 为 ,输入电阻 r i 为 K Ω(取小数点后 1 位),输出电阻 r o 为 K Ω 。
【单选题】Text … 【C1】______Thanksgiving turkey, it' s hard to find【C2】______'American' food. The United States is a land of【C3】______. So Americans eat food from many different countries. When people move to Am...