屏蔽A乙寄存器的低四位,可以用指令()
A.AND AL,0FOH
B.OR AL,80H
C.XOR AL,0FOH
D.TEST AL 01H
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A.AND AL,0FOH
B.OR AL,80H
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B.OR AL,80H
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B.OR AL,80H
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A.AND AL,0FOH
B.OR AL,80H
C.XOR AL,0FOH
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A.AND AL,0FOH
B.OR AL,80H
C.XOR AL,0FOH
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A.AND AL,0FOH
B.OR AL,80H
C.XOR AL,0FOH
D.TEST AL 01H
A.AND AL,0FOH
B.OR AL,80H
C.XOR AL,0FOH
D.TEST AL 01H
A.AND AL,0FOH
B.OR AL,80H
C.XOR AL,0FOH
D.TEST AL 01H