单项选择题

零件W依次串行经过A—B—C—D四个加工中心。四个加工中心的利用率分别为：A（70%);B（60%);C（100%);D（

零件W依次串行经过A—B—C—D四个加工中心。四个加工中心的利用率分别为：A(70%);B(60%);C(100%);D(80%)。现计划将这个系统的产能提高10%。请你在具体分析后提出你的方案或建议。

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