【单选题】
_____ you are leaving tomorrow, we can have dinner together tonight.
A. Since
B. While
C. For
D. Before
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15二极管具有___
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16图中D1-D3为理想二极管,A,B,C灯都相同,试问___灯最亮。
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18在单相桥式整流电容滤波电路中,设U2为其输入电压,输出电压的平均值约为___。
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【单选题】
19在单相桥式整流电路中,设U2为其输入电压,输出电压的平均值约为___。
A. U0=0.45U2
B. U0=1.2U2
C. U0=0.9U2
D. U0=1.4U2
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20在半波整流电容滤波电路中,设U2为其输入电压,输出电压的平均值约为___。
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21在半波整流电路中,设U2为其输入电压,输出电压的平均值约为___。
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【单选题】
22温度影响了放大电路中的___,从而使静态工作点不稳定。
A. 电阻;
B. 电容;
C. 三极管;
D. 电源。
【单选题】
23用直流电压表测得放大电路中某三极管各极电位分别是2V、6V、2.7V,则三个电极分别是___。
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【单选题】
24共射极放大电路的交流输出波形上半周失真时为___
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【单选题】
25三极管的反向电流ICBO是由___组成的。
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【单选题】
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【单选题】
28在以下三种电路中输入电阻最大的电路是___。
A. 共基放大电路
B. 共集放大电路
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【单选题】
29在以下三种电路中既能放大电流,又能放大电压的电路是___。
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【单选题】
30在以下三种电路中输出电阻最小的电路是___;
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