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【判断题】
在非对称加密方法中，对信息的加密和解密都使用相同的密钥。（ ）A.
正确
B.
错误
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参考解析：
知识点：
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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
【简答题】2kV= V ,610mV= V,1mV= μV= V
【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
【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】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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