客户开通手机证券某一项功能后，一个月内重复开通、取消该功能当月怎样收费？
参考答案：
当月只收取一次功能费。
— That's the third time he's won the award in this field.
— Yes. He ________ his maximum potential in the past decade. [ ]
A. explored
B. is exploring
C. has been exploring
D. has explored
在计算机指令中，规定其所执行操作功能的部分称为
A．地址码
B．源操作数
C．操作数
D．操作码
