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[null,"Потеря напора на преодоление трения, м  "]
[{"$nulls":7},"абсолютная эквивалентная шероховатость выбирается по таблице, мм"]
[]
[{"$nulls":4},"Т.к. потери давления = ",null,null,null,"отсюда",null,null,", Па"]
[]
[null,null,"- плотность, кг/м3",null,null," - линейная скорость, м/с",null,null,null," -– длина трубопровода, м"]
[null,null," - внутренний диаметр, м"]
[]
[]
[null,null,"- коэффициент гидравлического сопротивления, который",{"$nulls":4},"зависит от числа Рейнольдса  ",null,null,null,"Re=wd/v"]
[null,null,"(v-кинематическая вязкость)"]
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[null,"В случаях, когда"]
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["при",null,null,null,2320]
[]
[]
[{"$nulls":9},"гидравлически гладкие трубы"]
["при"]
[{"$nulls":8},"формула Блазиуса"]
[null,"исправить на 20"]
[]
["при",{"$nulls":8},"зана ДОквадратичного сопротивления"]
[]
[{"$nulls":8},"формула Альштулля"]
[]
["при"]
[{"$nulls":9},"зана квадратичного сопротивления"]
[]
[{"$nulls":9},"формула Шифринсона"]

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