Sequential circuit is a common logic device whose output values, at a given instant, depend upon its input values and the intern

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问题 Sequential circuit is a common logic device whose output values, at a given instant, depend upon its input values and the internal state at that instant, and whose internal state depends upon the(66)preceding input values and the preceding internal state. A sequential circuit can assume a finite number of internal states and may therefore be regarded, from an abstract(67), as a finite(68).Combinational circuit is another logic device whose output values, at any given instant, depend upon the input values at that instant. A combinational circuit is a(69)of a sequential circuit whose internal state is not taken(70).

选项 A、calculation
B、in account
C、audit
D、attention

答案B

解析 时序电路是一种常见的逻辑器件,在给定时刻,其输出值取决于它在该时刻的各输入值和内部状态,而其内部状态又取决于紧接的前面各输入值和内部状态。时序电路能取有限个内部状态,因此,从抽象的角度可看成是一种有限自动机。组合电路则是另一种逻辑器件,在任意时刻,其输出值都取决于该时刻的各输入值。组合电路是时序电路在不考虑其内部状态时的一种特例。
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