下列关于流水线方式执行指令的叙述中，不正确的是（ ）。
- A.流水线方式可提高单条指令的执行速度
- B.流水线方式下可同时执行多条指令
- C.流水线方式提高了各部件的利用率
- D.流水线方式提高了系统的吞吐率
正确答案及解析
正确答案
解析
本题要求选择不正确的叙述。其中A流水线方式可提高单条指令的执行速度是不正确的，对于只有单条指令的情况下，流水线方式与顺序执行时没有区别。流水线的原理是在某一时刻可以让多个部件同时处理多条指令，避免各部件等待空闲，由此提高了各部件的利用率，也提高了系统的吞吐率。
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