单项选择题
A.MOV AX,0 B.XOR AX,AX C.SUB AX,AX D.OR AX,0
A.XOR AL,AL B.AND AL,0 C.MOV AL,0 D.SUB AL,AL
A.ANDB.ORC.NOTD.XOR
A.8 B.16 C.32 D.64
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