In order to ensure the stability of surface structures in the mining process of filling test face in Taoyi Mining Area of Handan Mining Group. an active mechanical model of open filling and fully mechanized overlying rock with ultra-high water material was established based on the field geological conditions. deflection equations of backfill support zone and empty roof zone are derive... https://safeersappliancers.shop/product-category/bosch-gsn33vw3pg-frost-free-upright-freezer-with-225l-capacity-and-a-rating/