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URL：https://2.bp.blogspot.com/-0LzVEsCSXcY/UjMmNjxE7OI/AAAAAAAAUHc/a4OXmRSVD-s/s1600/Gráfica_Petrolera_16.jpg 掲載元：https://ingenieraenpetroleo.blogspot.com/2013/09/ecuacion-de-avance-frontal-o-ecuacion.html
