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【单选题】
Which statement about the communication between interfaces on the same security level is true?___
A. Interfaces on the same security level require additional configuration to permit interinterface communication
B. Configuring interfaces on the same security level can cause asymmetric routing
C. All traffic is allowed by default between interfaces on the same security level
D. You can configure only one interface on a n individual security level
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27如果在NPN型三极管放大电路中测得发射结为正向偏置,集电结也为正向偏置,则此管的工作状态为___
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当PNP型晶体管工作在放大区时,各极电位关系为uC ___uB。
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35在由PNP晶体管组成的基本共射放大电路中,当输入信号为1KHz、5mV的正弦电压时,输出电压波形出现了顶部削平的失真。这种失真是___ 。
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36在由PNP晶体管组成的基本共射放大电路中,当输入信号为1KHz、5mV的正弦电压时,输出电压波形出现了底部削平的失真。这种失真是___ 。
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37共集电极放大电路中Re的负反馈组态是___。
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【单选题】
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【单选题】
41为了提高三极管放大电路的输入电阻,采用___负反馈 i=i1+i2
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【单选题】
42为了稳定输出电流,采用___负反馈。
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43为了改善放大器的动态性能,应该引入___电路。
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44为了稳定放大器的静态工作点,应该引入___电路。
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C. 电压负反馈
D. 电流负反馈
【单选题】
45共模抑制比是差分放大电路的一个主要技术指标,它反映放大电路___能力。
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B. 输入电阻高
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【单选题】
46差分放大电路是为了___而设置的。
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【单选题】
47分析运放的“虚短”是指是___。
A. U-≈U+
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【单选题】
48分析运放的“虚断”是指是___。
A. U-≈U+
B. I-≈I+≈0
C. I-≈I+
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【单选题】
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 ___
A. -200mv;
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D. 100V
【单选题】
52通用型集成运放的输入级多采用___。
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【单选题】
53理想运放的两个重要性质是___。
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【单选题】
54振荡器的输出信号最初由___而来的。
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【单选题】
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C. AF=1
【单选题】
56从结构上来看,正弦振荡电路是一个 ___ 。
A. 有输入信号的负反馈放大器;
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【单选题】
57对频率稳定度要求较高的振荡器,要采用: ___ 。
A. LC振荡电路;
B. RC振荡电路;
C. RL振荡电路;
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【单选题】
58在甲类、乙类、甲乙类放大电路中,其导通角分别为___
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【单选题】
W78XX系和列W79XX系列引脚对应关系为 ___ 。
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【单选题】
60两个β相同的晶体管组成复合管后,其电流放大系数约为 ___ 。
A. β
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C. 2β
D. 1+β
【单选题】
1三极管的开关特性是___。
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B. 放大相当于开关接通
C. 饱和相当于开关接通
D. 截止相当于开关断开,饱和相当于开关接通
【单选题】
2数字集成门电路,目前生产最多应用最普遍的门电路是___
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3由一个三极管组成的基本门电路是___。
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5半导体发光数码管由___个条状的发光二极管组成。
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C. 7
D. 8
【单选题】
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A. 与逻辑
B. 或逻辑
C. 非逻辑
D. 与非逻辑
【单选题】
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A. 29
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【单选题】
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A. 图
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【单选题】
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