题目内容

Name the four Logical operations.

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Draw the truth tables for OR, XOR.

Using an 8-bit allocation,first convert each of the following numbers to two's complement,do the operation,and then convert the result to decimal.19+23

吸收式热泵由发生器、吸收器、冷凝器、蒸发器、节流阀及溶液泵等组成，其原理是利用由两种不同沸点的物质组成的溶液（也称工质对）的气液平衡特征进行工作。

A. 对
B. 错

【单选题】 ( )is a stand-alone storage location that holds data temporarily.

An ALU
B. A register
C. A control unit
D. A tape drive