【单选题】
42为了稳定输出电流，采用___负反馈。
A. 电流
B. 电压
C. 并联
D. 串联
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答案
A
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51两级放大电路，Au1=-40，Au2=-50，若输入电压U1=5mv，则输出电压Uo为 ___
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56从结构上来看，正弦振荡电路是一个 ___ 。
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58在甲类、乙类、甲乙类放大电路中，其导通角分别为___
A. 小于180 O、180 O、360O
B. 360O、180 O、小于180 O。
C. 180 O、小于180 O、360O
【单选题】
20TTL电路在正逻辑系统中，以下各种输入中___相当于输入逻辑“0”。
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