圆管断面直径由d1突然扩大到d2,若将一次扩大改为两级扩大,则该扩大的局部水头损失()。A、减小B、不变C、增大

圆管断面直径由d1突然扩大到d2,若将一次扩大改为两级扩大,则该扩大的局部水头损失()。

  • A、减小
  • B、不变
  • C、增大

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