Common ontology languages. construction principles and construction methods were summarized. It was considered that constructing coal mine safety ontology should adopt OWL-DL language and the construction method of cyclic acquisition method or seven-step method. Current research status of the coal mine safety ontology was analyzed from aspects of coal mine digging and coal mine disast... https://www.bekindtopets.com/great-pick-Nobivac-Feline-1-HCPCh-special-find/