负反馈有4种组态，若要求输入电阻低，输出电压稳定，则在放大电路中应引入______负反馈。
参考答案：电压并联(或并联电压)
Every citizen should be responsible _____ his behaviors.[ ]
A. for
B. with
C. on
D. to
职业轮换制度
