某四级指令流水线分别完成取指、取数、运算、保存结果四步操作。若完成上述操作的时间依次为8ns、9ns、4ns、8ns，则该流水线的操作周期应至少为（ ）ns。
- A.4
- B.8
- C.9
- D.33
正确答案及解析
正确答案
解析
流水周期为9ns。
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