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石英晶体振荡电路如图所示：
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石英晶体振荡电路如图所示：
时间：2022-01-01 13:27
关键词：
电子电路
电子与通信技术
大学试题
工学
答案解析
<p> （1）说明石英晶体在电路中的作用是什么？<br> （2）Rb1、Rb2、Cb的作用是什么？<br> （3）电路的振荡频率f0如何确定？</p>
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boost的意思是:help or encourage to increase or improve
eloquent的意思是:fluent or persuasive in speaking or writing
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
石英晶体多谐振荡器的振荡频率与电路中的R、C成正比。（ ）
A cabinet or space containing the controls or valves for the fixed firefighting system must be（）.
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晶体管黑白电视机行振荡电路，多采用变形间歇振荡电路，该电路的特点是，在一个振荡周期内产生两种振荡，一是间歇振荡；二是（）
石英晶体振荡电路如图所示：
Mainly east 3 or 4 partly cloudy to overcast occasional rain（）slowly south moderate or good.
在串联型石英晶体振荡电路中，晶体等效为（）。
（）any case or suspected case of quarantinable disease，or any case of eruptive disease or any death be discovered，the local quarantine officer must be notified immediately．
Should any case or suspected case of quarantinable disease，or any case of eruptive disease or any death be discovered，the local Quarantine Officer must be（）immediately.
Masters are（）solely responsible for all damages or accidents of whatever kind resulting from the navigating or handling of their vessels by day or by night.
If he is a common carrier，he is absolutely responsible to the owner of the goods carried （）any loss or damage to them unless caused by an Act of God or the Queen’s enemies，or the inherent vice in the goods themselves，or the negligence of the owner of the goods，or a general average sacrifice.
系统中雷达状态包括Unknown、Operational（or ON）、Failed（or OFF）、Detached。
Owners are to be responsible for loss of or damage to the goods or delay in delivery of the goods only in case the loss，damage or delay has been caused by the improper or negligent stowage of the goods．This means that（）.
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