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【简答题】
若想产生由1860Hz和1020Hz两种频率构成双音频信号 1)该双音频信号的重复周期和重复频率分别是多少? 2)在该重复周期内1860Hz的信号出现了多少个周期?1020Hz的信号出现了多少个周期? 3)需要有多少个存储单元?
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反馈参考答案：
举一反三
【单选题】由集成运放A1、A2等元器件组成的反馈放大电路如图所示。设A1、A2均为理想运放。电阻R 2 阻值增加,则级间负反馈的反馈深度将________;
A.
增大,
B.
减小,
C.
不变
【简答题】下列各项中，属于事业单位财务报表构成内容的有( )。 A.会计报表附注 B.资产负债表 C.收入支出表或收入费用表 D.财政补助收入支出表
【简答题】本课程有多少学时?
【简答题】本课程共多少学时？
【单选题】You are having a business lunch when your phone rings. It is an important phone call that you have been waiting for days. So the polite way to handle this situation is _______.
A.
take the call at the table and try to be quiet so you won’t disturb the other diners during the call
B.
turn your phone off completely and collect your voice mail messages afterward
C.
tell your associates at lunch that you’re expecting an important call, put your phone on vibrate mode and when the call does come, excuse yourself, leave the table and go to a place where no one can hear you. When you return to the table, thank your guest allowing you to take the call and don’t apologize or talk about the nature of the call.
【单选题】由集成运放A 1 、A 2 等元器件组成的反馈放大电路如图所示。设A 1 、A 2 均为理想运放。试分析电阻R 5 阻值增大,则级间负反馈的反馈深度将_________________;
A.
增大,
B.
减小,
C.
不变
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