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【简答题】在图15.9.14(在教材中)的源极输出器中，已知U DD =12V，R S =12kΩ，R G1 =1MΩ，R G2 =500kΩ，R G =1MΩ。试求静态值、电压放大倍数、输入电阻和输出电阻。设V S ≈V G ，g m =0.9mA/V
【单选题】—— Alice looks sad. Did you tell her about the accident? ——— Yes， but I ________ her just before her final exams.
A.
shouldn’t tell
B.
shouldn’t have told
C.
needn’t tell
D.
mustn’t have told
【单选题】——Alice looks sad. Did you tell her about the accident? ——Yes, but I ______ her just before her final examinations.
A.
should have told
B.
shouldn’t have told
C.
needn’t have told
D.
must have told
【简答题】在图15.41所示的源极输出器中，已知U DD =12V，R S =12kΩ，R G1 =1MΩ，R G2 =500kΩ，R G =1MΩ。试求：静态值、电压放大倍数、输入电阻和输出电阻。设V S ≈V G ，g m =0.9mA/V。
【单选题】--- Alice looks sad. Did you tell her about her brother’s accident? --- Sorry, I ________ her just before her final exams.
A.
can’t tell
B.
mustn’t have told
C.
needn’t tell
D.
shouldn’t have told
【单选题】运算放大器组成的电压表电路如图所示，已知输出端所接电压表满量程为5V，且RF=1MΩ。若要得到O．5V、5V、50V三种量程，则R1、R2、R3的阻值分别为：
A.
0．1MΩ，1MΩ，10MΩ
B.
O．5MΩ，5MΩ，50MΩ
C.
10MΩ，1MΩ，O．1MΩ
D.
50MΩ，5MΩ，O．5MΩ
【单选题】交流电梯额定速度不超过1m/s时，渐进行安全钳动作速度V应()M/S。
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