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听力原文： Ladies and gents at Giant Systems, I'd like to thank you for inviting me and my colleagues from Final Data Co. to discuss some innovative methods for dealing with storing, retrieving, and transmitting data through satellites. Let me demonstrate to you some of our products and explain how those new machines work with the new satellite system. We have some visual aids prepared before starting the main presentation. But first, I am sure you might want some things clarified. Are there any questions? What is the speaker's purpose in giving the talk?A.
To inquire about some information concerning the program.
B.
To explain how the new satellite works.
C.
To compliment colleagues for their performance.
D.
To showcase new products.
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【简答题】分析下图电路并回答: ( 1 )判断电路中引入了哪种组态的交流负反馈; ( 2 )该负反馈网络由哪些电阻组成? ( 3 )该负反馈对放大电路输入电阻和输出电阻的影响。
【简答题】图7所示电路中,开关S断开前,电容已充满电。请分析开关断开那一刻的电路状态,并回答如下问题: ( 1 )输出电压 Vo 和 I 1 分别是( )V和( )mA; ( 2 )输出电压稳定后 Vo 和 I 1 分别是 ( )V和( )mA。
【简答题】分析下图电路并回答: ( 1 )判断电路中引入了哪种组态的交流负反馈; ( 2 )该负反馈网络由哪些电阻组成? ( 3 )该负反馈对放大电路输入电阻和输出电阻的影响。
【简答题】分析下面的电路并回答问题： （1）写出电路激励方程、状态方程、输出方程 （2）画出电路的有效状态图 （3）当X=1时，该电路具有什么逻辑功能
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