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【简答题】
(北京大学2005年考研试题)一种增益线性调节的差动放大器电路如图5一10所示，前置级A1、A2起隔离作用，A4为反相比例放大器，构成A3的反馈回路，A3为差动主放大器。RP是增益调节电阻，各单元均可视为理想，试求该差动放大器的增益 。
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反馈参考答案：
举一反三
【简答题】A．Jane got a letter from her home today. B．Jane is expecting a letter from her family today. C．Jane wrote a letter to her family today. D．Jane wrote a letter to her family the day before yesterday.
【单选题】As soon as Jane_______theroom,she knew there was something wrong.
A.
Enters
B.
had entered
C.
entered
D.
was entering
【简答题】导游人员在带团过程中要充当管理者的角色，这要求导游要有很强的拉制能力。()
【单选题】What can we learn from the interview?
A.
Jane and Harry are sisters.
B.
Jane and Harry are undergraduates.
C.
Jane and Harry are postgraduates.
D.
Jane and Harry are teachers.
【单选题】Shared experience and common hatred toward the same enemy _________ together.
A.
bind
B.
bund
C.
bun
D.
bound
【单选题】In the speech, the speaker shared his experience of dealing with ______.
A.
salesman
B.
telemarketing
C.
marketing email
D.
TV shopping
【简答题】写在本上,拍照上传: “Culture” may be something defined by shared experience rather than shared nationality or ethnicity. (采分点:be defined by, shared experience, rather than, nationality, ethnicity)
【简答题】What is the experience shared by many first-time visitors to China?
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