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单选题 下图用3线—8线译码器74LS138和与非门实现的逻辑函数为( )
A. 
B. 
C. 
学科：数字电子技术
时间：2023-05-22 06:31:15
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题目1单选题
下图所示为某组合逻辑电路的输入A、B和输出Y的波形,该逻辑电路的逻辑式应为( ).<img src="https://tihai-oss-cloud.itihey.com/img/e5651cd847aa7ead46f22b5620320557.png">A. <img src="https://tihai-oss-cloud.itihey.com/img/e92e4b874be339e60e77035ac415768d.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/be1418dd23dceb57c2c426d78236f0b0.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/1233988b0b8713df2830e2374a19d3e0.png">
题目2单选题
<img src="https://tihai-oss-cloud.itihey.com/img/d3a8c3c254f98326a5c106041c373904.png"><img src="https://tihai-oss-cloud.itihey.com/img/38360be53726798d9ae8ff90c99bc70e.png">A. <img src="https://tihai-oss-cloud.itihey.com/img/ef97f46c06d5a7f638c7cb5bcbec6c8c.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/80a33910b36f43e26bf4c0cee63dc5e6.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/5003c61a0b0483fd17eaa32934dd6e04.png">
题目3单选题
若在编码器中有50 个编码对象,则输出二进制代码位数应为( ) 位A. 5B. 6C. 10D. 50
题目4单选题
若把某一全加器的进位输出接至另一全加器的进位输入,则可构成( )A. 二位并行进位的全加器B. 二位串行进位的全加器C. 一位串行进位的全加器
题目5单选题
下图用3线—8线译码器74LS138和与非门实现的逻辑函数为( )<img src="https://tihai-oss-cloud.itihey.com/img/43988309d0eb25f4921147c1d815379c.png">A. F=AB+BC+ACB. F=AB+BCC. F=BC+AC
题目6单选题
下图由8选1数据选择器74HC151实现的函数为()<img src="https://tihai-oss-cloud.itihey.com/img/22ddd4cd8cd1af287c67e34074052b85.png">A. <img src="https://tihai-oss-cloud.itihey.com/img/2222d4339420d829a45f493850f85adf.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/c15f41f855ebdf9e0b05a512c283a607.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/9b3217551fd50b0114f9e6da60c6721b.png">
题目7单选题
下图用3线—8线译码器74LS138和与非门实现的逻辑函数为( )<img src="https://tihai-oss-cloud.itihey.com/img/05b71df17145156481c2fbf2da72fc99.png">A. <img src="https://tihai-oss-cloud.itihey.com/img/e1e1cea2860b7199fad019b5b2c2290e.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/9ec8758ede0642066bbdddac8a408a59.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/7236f34f968ffe0e307f4e28c56a6b34.png">
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