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【单选题】
某计算机指令集中包含有RR型运算指令、访存指令Load、Store、分支指令Branch和跳转指令Jump。若采用单周期数据通路实现该指令系统，若指令存储器和数据存储器的都是3ns;ALU为2ns;寄存器文件读写都是1ns。在不考虑多路复用器、控制单元、PC、符号扩展单元和传输线路等延迟的情况下，该计算机时钟周期至少为（ ）。A.
6ns
B.
8ns
C.
10ns
D.
12ns
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