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【简答题】
水流通过一块长L=30m，宽b=3m的平板。已知U 0 =6m/s，水的运动黏滞系数ν=10 -6 m 2 /s，试求(1)平板前面x=3m一段的摩擦阻力。 (2)L=30m长板的摩擦阻力。
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