It is reported that the safety of mining has always been a problem worthy of attention. For some safety hazards, there must be some precursors at the beginning. What are the signs of faults? It generally includes the following four aspects: 1, to a larger inclined coal layer is changed; 2. The top and bottom of the coal seam are seriously uneven, and the rock has large cracks; 3. The thickness of the coal seam changes significantly, the coal seam is soft, the gloss is darkened, and the sliding surface is increased; 4, broken with water or water, gas emission increased. Aluminium Air-conditioner Foil Cheap Aluminium Air-Conditioner Foil,Custom Aluminium Air-Conditioner Foil,New Designed Aluminium Foil,Aluminium Air-Conditioner Foil Jiangyin Xinren Aluminium Technology Co.,Ltd , https://www.xinrenaluminium.com