• 2022-06-03 问题

    设计一组合数字电路, 输入为四位二进制码 [tex=4.714x1.214]LFDB4RAENC3Rt/f1PuMEqzAxO62G6vwsahUWwgTm32g=[/tex]当 [tex=4.5x1.214]LFDB4RAENC3Rt/f1PuMEqzL48lCPm1OGPcHdqU+hozY=[/tex] 是 BCD8421 码时输出 [tex=2.143x1.214]Fu5qN5TZKsBKASTiipHu6Q==[/tex]否则[tex=1.929x1.0]lmYQbGR1AoXErAfJqRUqGw==[/tex] 。要求列出真值表,写出与或非型表达式,用集电极开路门实现。

    设计一组合数字电路, 输入为四位二进制码 [tex=4.714x1.214]LFDB4RAENC3Rt/f1PuMEqzAxO62G6vwsahUWwgTm32g=[/tex]当 [tex=4.5x1.214]LFDB4RAENC3Rt/f1PuMEqzL48lCPm1OGPcHdqU+hozY=[/tex] 是 BCD8421 码时输出 [tex=2.143x1.214]Fu5qN5TZKsBKASTiipHu6Q==[/tex]否则[tex=1.929x1.0]lmYQbGR1AoXErAfJqRUqGw==[/tex] 。要求列出真值表,写出与或非型表达式,用集电极开路门实现。

  • 2022-06-16 问题

    图 [tex=1.786x1.0]fMCmF5EoMWW1/reRW3FAAA==[/tex]表示一个时序状态机的状态转换图。 该状态机有四个状态, 在时钟作用下, 状态 机在四个状态之间轮流转换。状态机的状态 由[tex=2.5x1.286]oAG1ag4HUGNxikHpPyMaJQ==[/tex]两个寄存器 (触发器) 定义: 当 [tex=4.357x1.214]P8svevOT3gvhHIZGTeKNsg==[/tex]时, 输出信号[tex=2.429x1.0]lmYQbGR1AoXErAfJqRUqGw==[/tex]; 其余[tex=2.5x1.286]oAG1ag4HUGNxikHpPyMaJQ==[/tex]组合情况下, 输出 [tex=0.643x1.0]jDVSpgNhHe+VJmgvx3gg1Q==[/tex]均为 1 。 用 [tex=1.714x1.0]CGu4n2rpin8+Dzga1NPAhQ==[/tex]器件设计该时序状态机, 写出 [tex=2.929x1.0]6eoOGVTbOaCfVxCWuJiOvw==[/tex]源文件。[img=328x278]17d4c3386d73087.png[/img]

    图 [tex=1.786x1.0]fMCmF5EoMWW1/reRW3FAAA==[/tex]表示一个时序状态机的状态转换图。 该状态机有四个状态, 在时钟作用下, 状态 机在四个状态之间轮流转换。状态机的状态 由[tex=2.5x1.286]oAG1ag4HUGNxikHpPyMaJQ==[/tex]两个寄存器 (触发器) 定义: 当 [tex=4.357x1.214]P8svevOT3gvhHIZGTeKNsg==[/tex]时, 输出信号[tex=2.429x1.0]lmYQbGR1AoXErAfJqRUqGw==[/tex]; 其余[tex=2.5x1.286]oAG1ag4HUGNxikHpPyMaJQ==[/tex]组合情况下, 输出 [tex=0.643x1.0]jDVSpgNhHe+VJmgvx3gg1Q==[/tex]均为 1 。 用 [tex=1.714x1.0]CGu4n2rpin8+Dzga1NPAhQ==[/tex]器件设计该时序状态机, 写出 [tex=2.929x1.0]6eoOGVTbOaCfVxCWuJiOvw==[/tex]源文件。[img=328x278]17d4c3386d73087.png[/img]

  • 2022-06-04 问题

    某组合电路的输入[tex=1.214x1.0]J1nFGOg1dxuMTkVANmry+g==[/tex]利输出[tex=0.643x1.0]jDVSpgNhHe+VJmgvx3gg1Q==[/tex]均为三位二进制数。当 [tex=2.714x1.071]7sb+jFOygLceGWrwlxZ45Q==[/tex]时, [tex=1.929x1.0]ebYdLVslVpPZa8fPZvS+/g==[/tex]; 当[tex=4.5x1.143]tXOmxuvAcaiMnJm5aDHsYL+SeepsF7kF3/P/j3zt/7I=[/tex] 时, [tex=4.071x1.143]RqcgKx/QaJXw/fuQm4fVjA==[/tex] ;当 [tex=2.714x1.071]v+QcKfYai3GueZKxwKu9tg==[/tex]时, [tex=2.429x1.0]lmYQbGR1AoXErAfJqRUqGw==[/tex]。试用一片[tex=2.286x1.143]JV7EbLyGYm/OK2nio3ULlA==[/tex]译码器和少量逻辑门实现该 电路.

    某组合电路的输入[tex=1.214x1.0]J1nFGOg1dxuMTkVANmry+g==[/tex]利输出[tex=0.643x1.0]jDVSpgNhHe+VJmgvx3gg1Q==[/tex]均为三位二进制数。当 [tex=2.714x1.071]7sb+jFOygLceGWrwlxZ45Q==[/tex]时, [tex=1.929x1.0]ebYdLVslVpPZa8fPZvS+/g==[/tex]; 当[tex=4.5x1.143]tXOmxuvAcaiMnJm5aDHsYL+SeepsF7kF3/P/j3zt/7I=[/tex] 时, [tex=4.071x1.143]RqcgKx/QaJXw/fuQm4fVjA==[/tex] ;当 [tex=2.714x1.071]v+QcKfYai3GueZKxwKu9tg==[/tex]时, [tex=2.429x1.0]lmYQbGR1AoXErAfJqRUqGw==[/tex]。试用一片[tex=2.286x1.143]JV7EbLyGYm/OK2nio3ULlA==[/tex]译码器和少量逻辑门实现该 电路.

  • 2022-06-01 问题

    for i in range(b.max_row): for j in range(b.max_column): print(b.cell(row=i,column=j).value)上面语句运行的结果是:__________。 A: 1 1 1 1 1 1 1 1 1 1 B: 1111111111 C: 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 D: 出现异常

    for i in range(b.max_row): for j in range(b.max_column): print(b.cell(row=i,column=j).value)上面语句运行的结果是:__________。 A: 1 1 1 1 1 1 1 1 1 1 B: 1111111111 C: 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 D: 出现异常

  • 2021-04-14 问题

    【单选题】CDMA通信的基站,假定基站A的码片序列是+1 +1 +1 -1 -1 +1 -1 -1,基站发射bit为101时,实际发射的信号是 A. +1 +1 +1 -1 -1 +1 -1 -1 +1 +1 +1 -1 -1 +1 -1 -1 –1 –1 –1 +1 +1 –1 +1 +1 B. +1 +1 +1 -1 -1 +1 -1 -1 –1 –1 –1 +1 +1 –1 +1 +1 +1 +1 +1 -1 -1 +1 -1 -1 C. +1 +1 +1 -1 -1 +1 -1 -1 +1 +1 +1 -1 -1 +1 -1 -1 +1 +1 +1 -1 -1 +1 -1 -1 D. –1 –1 –1 +1 +1 –1 +1 +1 –1 –1 –1 +1 +1 –1 +1 +1 –1 –1 –1 +1 +1 –1 +1 +1

    【单选题】CDMA通信的基站,假定基站A的码片序列是+1 +1 +1 -1 -1 +1 -1 -1,基站发射bit为101时,实际发射的信号是 A. +1 +1 +1 -1 -1 +1 -1 -1 +1 +1 +1 -1 -1 +1 -1 -1 –1 –1 –1 +1 +1 –1 +1 +1 B. +1 +1 +1 -1 -1 +1 -1 -1 –1 –1 –1 +1 +1 –1 +1 +1 +1 +1 +1 -1 -1 +1 -1 -1 C. +1 +1 +1 -1 -1 +1 -1 -1 +1 +1 +1 -1 -1 +1 -1 -1 +1 +1 +1 -1 -1 +1 -1 -1 D. –1 –1 –1 +1 +1 –1 +1 +1 –1 –1 –1 +1 +1 –1 +1 +1 –1 –1 –1 +1 +1 –1 +1 +1

  • 2022-06-01 问题

    for i in range(1,11): for j in range(1,11): b.cell(row=i,column=j).value=1 #b是一个工作表对象for i in range(1,11): for j in range(1,11): print(b.cell(row=i,column=j).value,end=" ") print()上面程序代码运行的结果是()。 A: 1 B: 1 1 1 1 1 1 1 1 1 1 C: 1111111111 D: 1 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 1

    for i in range(1,11): for j in range(1,11): b.cell(row=i,column=j).value=1 #b是一个工作表对象for i in range(1,11): for j in range(1,11): print(b.cell(row=i,column=j).value,end=" ") print()上面程序代码运行的结果是()。 A: 1 B: 1 1 1 1 1 1 1 1 1 1 C: 1111111111 D: 1 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 1

  • 2022-10-25 问题

    下列哪个码片序列不能用于CDMA通信 A: ( -1 -1 -1 +1 +1 -1 +1 +1 ) B: ( -1 -1 +1 -1 +1 +1 +1 -1 ) C: ( -1 +1 -1 +1 +1 -1 -1 -1 ) D: ( -1 +1 -1 -1 -1 -1 +1 -1 )

    下列哪个码片序列不能用于CDMA通信 A: ( -1 -1 -1 +1 +1 -1 +1 +1 ) B: ( -1 -1 +1 -1 +1 +1 +1 -1 ) C: ( -1 +1 -1 +1 +1 -1 -1 -1 ) D: ( -1 +1 -1 -1 -1 -1 +1 -1 )

  • 2021-04-14 问题

    请仔细观察下面行列式的计算过程,如果四个等号都理解了,请选择A,否则请选择B。 | a 1 1 1 1 | |a+4 a+4 a+4 a+4 a+4| | 1 a 1 1 1 | | 1 a 1 1 1 | | 1 1 a 1 1 |= | 1 1 a 1 1 | | 1 1 1 a 1 | | 1 1 1 a 1 | | 1 1 1 1 a | | 1 1 1 1 a | | 1 1 1 1 1 | | 1 a 1 1 1 | =(a+4) | 1 1 a 1 1 | | 1 1 1 a 1 | | 1 1 1 1 a | | 1 1 1 1 1 | | 0 a–1 0 0 0 | =(a+4) | 0 0 a–1 0 0 | | 0 0 0 a–1 0 | | 0 0 0 0 a–1 | =(a+4)(a–1)^4

    请仔细观察下面行列式的计算过程,如果四个等号都理解了,请选择A,否则请选择B。 | a 1 1 1 1 | |a+4 a+4 a+4 a+4 a+4| | 1 a 1 1 1 | | 1 a 1 1 1 | | 1 1 a 1 1 |= | 1 1 a 1 1 | | 1 1 1 a 1 | | 1 1 1 a 1 | | 1 1 1 1 a | | 1 1 1 1 a | | 1 1 1 1 1 | | 1 a 1 1 1 | =(a+4) | 1 1 a 1 1 | | 1 1 1 a 1 | | 1 1 1 1 a | | 1 1 1 1 1 | | 0 a–1 0 0 0 | =(a+4) | 0 0 a–1 0 0 | | 0 0 0 a–1 0 | | 0 0 0 0 a–1 | =(a+4)(a–1)^4

  • 2021-04-14 问题

    共有4个站进行码分多址通信。4个站的码片序列为:a:(-1 -1 -1 +1 +1 -1 +1 +1) b:(-1 -1 +1 -1 +1 +1 +1 -1) c:(-1 +1 -1 +1 +1 +1 -1 -1) d:(-1 +1 -1 -1 -1 -1 +1 -1) 现收到这样的码片序列:(-1 +1 -3 +1 -1 -3 +1 +1),则( )发送1。

    共有4个站进行码分多址通信。4个站的码片序列为:a:(-1 -1 -1 +1 +1 -1 +1 +1) b:(-1 -1 +1 -1 +1 +1 +1 -1) c:(-1 +1 -1 +1 +1 +1 -1 -1) d:(-1 +1 -1 -1 -1 -1 +1 -1) 现收到这样的码片序列:(-1 +1 -3 +1 -1 -3 +1 +1),则( )发送1。

  • 2022-06-09 问题

    共有四个站进行CDMA通信,现收到这样的码片序列(-3 +1 -1 -1 +1 +1 +1 -3),则下列站点发送了数据1的是( ) A: (-1 -1 -1 +1 +1 -1 +1 +1) B: (-1 -1 +1 -1 +1 +1 +1 -1) C: (-1 +1 -1 +1 +1 +1 -1 -1) D: (-1 +1 -1 -1 -1 -1 +1 -1)

    共有四个站进行CDMA通信,现收到这样的码片序列(-3 +1 -1 -1 +1 +1 +1 -3),则下列站点发送了数据1的是( ) A: (-1 -1 -1 +1 +1 -1 +1 +1) B: (-1 -1 +1 -1 +1 +1 +1 -1) C: (-1 +1 -1 +1 +1 +1 -1 -1) D: (-1 +1 -1 -1 -1 -1 +1 -1)

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