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La presión estática del aire en el interior de un conducto es:a) siempre superior a la presión atmosférica exterior.b) representa la velocidad con la que circula el aire en su interior.c) en el tramo situado entre el ventilador en extracción y la campana de entrada es siempre negativa, inferior a la atmosférica.d) no varía en todo el tramo si se mantiene la misma velocidad de circulación el aire.

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