题目内容

In this last extract there are four gaps to be filled and 6 words/phrases to choose from.For instance, Unless, because, because of, while, even thoughPlease note:the answers are case-sensitive._____________raising tariffs is intended to improve the financial health of utilities, it does not always lead to higher revenue. Consumption can fall if consumers pursue other alternatives. Often these are unsafe and unhealthy. In Malawi,______________, a 25 per cent increase in electricity prices led to a record use of charcoal_____________its production has been illegal since 1997 ___________its contribution to deforestation.

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一个初始状态为000的异步三位二进制加法计数器,当第4个CP脉冲过后,计数器状态变为( )。

A. 010
B. 100
C. 101
D. 011

下列关于时序电路的描述,错误的是():

A. 时序电路常包含组合电路和存储电路两部分;
B. 时序电路必须包含组合电路;
C. 时序电路必须包含存储电路
D. 时序电路可以没有输入变量。

用T触发器构成的同二进制减计数器,下列说法正确的是()。

A. 低位的原变量输出端相或后作为该位输入端T的逻辑式。
B. 低位的反变量输出端“相与”后作为该位输入端T的逻辑式。
C. 低位的反变量输出端相或后作为该位输入端T的逻辑式。
D. 低位的原变量输出端相与后作为该位输入端T的逻辑式。

74LS161和74LS160的功能表相同。

A. 对
B. 错

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