超星 - L9-句子词汇 - 查题吧

单选题

Digital circuits are electric circuits based on two discrete voltage levels labeled ‘Low’ ( 0 ) and ‘High’ ( 1 ) . Often ‘Low’ will be near zero volts and ‘High’ will be at a higher level depending on the supply voltage in use.

A. 离散电压值
B. 基于
C. 供电电压
D. 数字电路

单选题

Computers, electronic clocks, and programmable logic controllers are constructed of digital circuits.

A. 计算机
B. 电子钟
C. 编程逻辑控制器
D. 数字电路

单选题

There are six basic logic gates: AND, OR, NOT, NAND , NOR, and XOR.

A. 逻辑门
B. 异或门
C. 与非门
D. 或非门

单选题

Take XOR as an example, the basic operations of XOR ( Exclusive-OR ) gate are described below with the aid of its truth table .

A. 真值表
B. 借助于
C. 描述
D. 操作

单选题

A logic gate is an elementary building block of a digital circuit. Using combinations of logic gates, complex operations can be performed.

A. 构件（积木）
B. 复杂操作
C. 组合
D. 逻辑门

单选题

A NOR gate can have two or more inputs. The dot 'o' on the output means 'not' showing that it is a Not OR gate. The output of a NOR gate is true when none of its inputs are true.

A. 多个输入
B. 逻辑真
C. 与非门
D. 或非门

单选题

The Flip-flop is the basic storage element in sequential logic ( in contrast to combinational logic ) .

A. 时序逻辑
B. 组合逻辑
C. 触发器
D. 存储元素

单选题

The truth table shown summarizes the operations of the positive edge-triggered D flip-flop. On the rising edge of the clock signal, if the block is enabled, the output Q is the same as the input D.

A. D触发器
B. 时钟信号上升沿
C. 正边沿触发
D. 使能

单选题

A counter can be implemented quite easily using register-type circuits such as the flip-flop.

A. 寄存器
B. 计数器
C. 电路
D. 触发器

单选题

The 4-bit binary synchronous counter. counts upwards starting from ‘0000’ until it reaches an output ‘1111’ on each rising edge of the input clock signal .

A. 时钟信号
B. 同步计数器
C. 二进制
D. 上升沿

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