《电子技术基础（1）（下）1346》21秋川大在线作业2答案
《电子技术基础（1）（下）1346》21春在线作业21.[单选题] 若译码/驱动器输出为低电平时，显示器发光则显示器应选用
A.共阴极显示器
B.共阳极显示器
C.共阳共阴极显示器都可以
D.不能确定
答:——B——
2.[单选题]
答:——D——
3.[单选题] 三位二进制数码可以表示的状态有
A.4种
B.8种
C.16种
D.2种
答:——B——
4.[单选题] 用3线-8线译码器74LS138和辅助门电路实现逻辑函数<img id="ODdgpymTEMP20191226025051228.png" src="http://oescdn.open.com.cn/zyglpt/OD/TEMP/2019/1226/ODdgpymTEMP20191226025051228.png?Expires=1892703051&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=u0xf/IXbE0SyWOPEH%2B0WHcTS6ik%3D" />，应（ ）。
A.用与非门，Y=<img id="ODntlycTEMP20191226025051450.png" src="http://oescdn.open.com.cn/zyglpt/OD/TEMP/2019/1226/ODntlycTEMP20191226025051450.png?Expires=1892703051&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=77JXzW3jfOTXw9GMZ%2BRMLuUlCWk%3D" />
B.用与门，Y=<img id="ODzzlrcTEMP20191226025051511.png" src="http://oescdn.open.com.cn/zyglpt/OD/TEMP/2019/1226/ODzzlrcTEMP20191226025051511.png?Expires=1892703051&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=M/pl3Bd7lxJr0PBcPVJRppFi5rQ%3D" />
C.用或门，Y=<img id="ODblzxuTEMP20191226025051737.png" src="http://oescdn.open.com.cn/zyglpt/OD/TEMP/2019/1226/ODblzxuTEMP20191226025051737.png?Expires=1892703051&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=YV4gvWmr6U/t%2B5w9YD4UENRZJWw%3D" />
D.用或门，Y=<img id="ODiinbgTEMP20191226025051922.png" src="http://oescdn.open.com.cn/zyglpt/OD/TEMP/2019/1226/ODiinbgTEMP20191226025051922.png?Expires=1892703052&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=kSS7Rl18uRAy78hz9lrjjeeWA3g%3D" />
答:————
5.[单选题] 石英晶体多谐振荡器的突出优点是（ ）。
A.速度高
B.振荡频率稳定
C.电路简单
D.输出波形边沿陡峭
答:————
6.[单选题] 函数<img id="ODnprxhTEMP20191226045011509.png" src="http://oescdn.open.com.cn/zyglpt/OD/TEMP/2019/1226/ODnprxhTEMP20191226045011509.png?Expires=1892710211&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=RF/WxJBg0Q038OgfNrrfxlygIH4%3D" />的反函数为 ( ) 。
A.<img id="ODivbilTEMP20191226045011593.png" src="http://oescdn.open.com.cn/zyglpt/OD/TEMP/2019/1226/ODivbilTEMP20191226045011593.png?Expires=1892710211&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=8lHoLyK2IXqhilc06YMc7AXug0I%3D" />
B.<img id="ODjnieuTEMP20191226045011760.png" src="http://oescdn.open.com.cn/zyglpt/OD/TEMP/2019/1226/ODjnieuTEMP20191226045011760.png?Expires=1892710211&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=NX/63R5TY9jiUSJZePsfCHYCPZc%3D" />
C.<img id="ODdoqgaTEMP20191226045011915.png" src="http://oescdn.open.com.cn/zyglpt/OD/TEMP/2019/1226/ODdoqgaTEMP20191226045011915.png?Expires=1892710212&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=iYYbnKGz6piZh18iSHit8q69lFM%3D" />
D.<img id="ODyeagzTEMP20191226045012076.png" src="http://oescdn.open.com.cn/zyglpt/OD/TEMP/2019/1226/ODyeagzTEMP20191226045012076.png?Expires=1892710212&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=8YA%2BA9na8NpMJb/zlio1UgBVQvU%3D" />
答:————
7.[单选题] 逻辑图和输入A，B的波形如图所示，分析当输出F为“1”的时刻应是( )。<br><img id="ODqhozfTEMP20191226045009516.png" src="http://oescdn.open.com.cn/zyglpt/OD/TEMP/2019/1226/ODqhozfTEMP20191226045009516.png?Expires=1892710209&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=WwuVbmeEIfy3u/wuh2B7U3LOH1Y%3D" />
A.t1
B.t2
C.t3
D.无
答:————
8.[单选题] 数（100 1011）2 相应的十进制数是( )。
A.35
B.59
C.75
D.87
答:————
9.[单选题] 与二进制数100011相应的十进制数是( )。
A.35
B.19
C.23
D.67
答:————
10.[单选题] 用4选1数据选择器实现函数<img id="ODipjziTEMP20191226025050519.png" src="http://oescdn.open.com.cn/zyglpt/OD/TEMP/2019/1226/ODipjziTEMP20191226025050519.png?Expires=1892703050&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=HdTy8UARd5Mpk1FbExGHlM5CxpE=">，应使（ ）。
A.<img class="kfformula" src="data:image/png;base64,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" data-latex="{D}_{0}={D}_{1}=0,{D}_{2}={D}_{3}=1">
B.<img src="http://file.open.com.cn/ueditorupload/image/2019/12/27/6371304179767877232252611.png" title="2-16-B.png" alt="2-16-B.png">
C.<img src="http://file.open.com.cn/ueditorupload/image/2019/12/27/6371304181290817985619461.png" title="2-16-C.png" alt="2-16-C.png">
D.<img src="http://file.open.com.cn/ueditorupload/image/2019/12/27/6371304183062610704360105.png" title="2-16-D.png" alt="2-16-D.png">
答:————
11.[单选题] 有一位二进制数码（信号）需暂时存放应选用的器件是
A.触发器
B.选择器
C.译码器
D.编码器
答:————
12.[单选题] 设负边沿触发的JK触发器的初始状态为0，CP、J、K信号如图所示，其Q端波形正确的（ ）。<br><img id="ODolubjTEMP20191226045019225.png" src="http://oescdn.open.com.cn/zyglpt/OD/TEMP/2019/1226/ODolubjTEMP20191226045019225.png?Expires=1892710219&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=urzO2UtjOZXj6zqxpsQsUY77EUc%3D" />
A.<img id="ODuoxldTEMP20191226045019377.png" src="http://oescdn.open.com.cn/zyglpt/OD/TEMP/2019/1226/ODuoxldTEMP20191226045019377.png?Expires=1892710219&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=lHL1SaXCNm5J3FL1eD6pel/EQHE%3D" /><br>
B.<img id="ODbcauuTEMP20191226045019542.png" src="http://oescdn.open.com.cn/zyglpt/OD/TEMP/2019/1226/ODbcauuTEMP20191226045019542.png?Expires=1892710219&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=U0dW4B/CVGxDOr8V6GxQ9k0aqB8%3D" /><br>
C.<img id="ODsyeprTEMP20191226045019623.png" src="http://oescdn.open.com.cn/zyglpt/OD/TEMP/2019/1226/ODsyeprTEMP20191226045019623.png?Expires=1892710219&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=TfGmN04/ngmtE2Ywh2JJdH0M8WA%3D" /><br>
D.<img id="ODjjvsuTEMP20191226045019887.png" src="http://oescdn.open.com.cn/zyglpt/OD/TEMP/2019/1226/ODjjvsuTEMP20191226045019887.png?Expires=1892710219&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=%2BOVUJt/9b5HdyEH3BYZTkvvp0jw%3D" />
答:————
13.[单选题]
答:————
14.[单选题] 下列触发器中不能用于计数功能的是（ ）。
A.下降沿触发的T触发器
B.边沿型D触发器
C.边沿型JK触发器
D.单稳态触发器
答:————
15.[单选题] 与8进制数(47.3)8等值的数为（）。
A.<img class="kfformula" src="data:image/png;base64,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" data-latex="{（100111.011）}_{2}">
B.<img class="kfformula" src="data:image/png;base64,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" data-latex="{（27.8）}_{16}">
C.<img class="kfformula" src="data:image/png;base64,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" data-latex="{（27.3）}_{16}">
D.00010110
答:————
16.[判断题] 显示器的作用仅显示数字。
A.错误
B.正确
答:————
17.[判断题] 计数器具有定时作用.
A.错误
B.正确
答:————
18.[判断题] 在具有三组与输入端的与或非门中，当只使用其中的两组与输入端时，余下的一组与输入端应接高电平。
A.对
B.错
答:————
19.[判断题] 555定时器是仅用于产生定时脉冲的时序逻辑功能器件。
A.对
B.错
答:————
20.[判断题] 最简逻辑函数表达式是唯一的。
A.对
B.错
答:————
21.[判断题] 14. 一般D/A转换器由电子开关、电阻网络、求和放大器、标准电压四部分组成。
A.错误
B.正确
答:————
22.[判断题] 可将TTL与非门多余输入端经电阻接正5V电源。
A.错误
B.正确
答:————
23.[判断题] 11. 通常将二进制计数器与五进制计数器上串，可得到十进制计数器，若将十进制计数器与六进制计数器相串，可得十六进制计数器。
A.错误
B.正确
答:————
24.[判断题] 9. 计数器可以作分频器。
A.错误
B.正确
答:————
25.[判断题] ROM和RAM是结构相同但性能不同的存储器。
A.对
B.错
答:————
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