【单选题】【消耗次数：1】
在计算机指令系统中，确定操作数有多种方法。当操作数直接由指令给出时称为。
①
间接寻址
②
立即寻址
③
寄存器寻址
④
变址寻址
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【单选题】
下列指令中，源操作数的寻址方式中，（ ）属于寄存器间接寻址
①
MOV AX，[4000H]
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MOV [BX]，AX
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SUB AX，2000H
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【单选题】
下列指令中，源操作数的寻址方式中，（ ）属于寄存器寻址
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MOV AX，[4000H]
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MOV [BX]，AX
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C）SUB AX，2000H
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MOV AX，[SI+12H]
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