PC machine CPU for arithmetic and logical operations, can handle the length of the information for A.
PC机中CPU进行算术和逻辑运算时，可处理的信息的长度为A 。
Thee Arithmetic-Logic Unit——The arithmetic-logic unit, usually called the ALU, performs twotypes of operations—arithmetic and logical.
算术-逻辑单元算术-逻辑单元，通常被称为ALU，完成两类运箅一算术和逻辑。
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