如果按变址方式读取操作数，则有效地址是指（ ）。
- A.基址寄存器中存放的地址
- B.变址计算获得的地址
- C.变址寄存器中存放的地址
- D.指令中直接给出的地址
正确答案及解析
正确答案
B
解析
变址寻址方式是将地址码和变址寄存器内容相加后形成数据的地址，它的有效地址是计算后的地址。由于变址寄存器能自动修改，这种方式对数组运算、字符串操作等批量数据的处理非常有效。
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