With the gradual increase in mining depth of coal fields in North China. the threat posed by karstic Ordovician limestone water to the safe stoping of mines is becoming increasingly prominent. Investigating the water-resisting property of the filling zone on the top of the Ordovician limestone provides the key to safe mining under pressure. This paper analyzed the formation process of... https://www.bekindtopets.com/mega-sale-Israel-Flag-Distressed-iPhone-14-Pro-Max-Folio-Case-p26681-top-mega/