问题
单项选择题
下列指令中不合法的指令有______。 ①MOV [SI]，[DI] ②IN AL，DX ③IMP WORD PTR [BX] ④PUSH WORD PTR 10[BX+9]
A．1条
B．2条
C．3条
D．4条
答案
参考答案：A
解析： 在MOV指令中，源地址为基址变址寻址，则SI(或DI)应与BP或BX组合使用，但SI、DI不能一起使用。
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下列指令中不合法的指令有______。 ①MOV [SI]，[DI] ②IN AL，DX ③IMP WORD PTR [BX] ④PUSH WORD PTR 10[BX+9]
A．1条
B．2条
C．3条
D．4条
参考答案：A
解析： 在MOV指令中，源地址为基址变址寻址，则SI(或DI)应与BP或BX组合使用，但SI、DI不能一起使用。
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