题目内容

分析下列指令功能，能够实现将AL寄存器中的低4位置1的指令为。

AND AL,0FH
B. OR AL, 0FH
C. TEST AL,0FH
D. XOR AL, 0FH

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将AX清零并使CF=0，下面指令错误的是

A. SUB AX,AX
B. XOR AX,AX
C. MOV AX,0
D. AND AX,0000H

阅读下面程序段：MOV AL，08HMOV BL，ALADD AL，BLCMP AL, BL上述程序执行后：AL=ZF=

XOR AX,AXOR AX,0040HTEST AX,0040H上述程序段执行后AX=,ZF=.

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