First  Each stope must have two safety exits, and connect the upper and lower roadways. The sidewalks should be located outside the veins. The support of the safety exits must be fastened and the ladders must be provided. If there are two exits due to special circumstances, it must be Approved by the company security committee. Second  The mining site has a reasonable mining sequence, and the mining site is basically smooth and unobstructed. Article 3  The mining mine funnel should meet the requirements of the support regulations. The depth of the mine should not exceed 3.5 meters, and there is a qualified sieve. Article 4  The stope operation must have sufficient lighting, and must be operated strictly in accordance with the safety operation rules of each type of work.
Polystyrene is a synthetic polymer made from monomers of the aromatic hydrocarbon styrene. GPPS Resin can be solid or foamed. General-purpose polystyrene is clear, hard, and brittle. It is an inexpensive resin per unit weight. It is a poor barrier to oxygen and water vapour and has a relatively low melting point. Polystyrene is one of the most widely used plastics, the scale of its production being several million tonnes per year. Polystyrene can be naturally transparent, but can be colored with colorants. Uses include protective packaging, containers, lids, bottles, trays, tumblers, disposable cutlery, in the making of models, and as an alternative material for phonograph records.
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