General items: Mining machinery manufacturing; Mining machinery sales; Environmental protection special equipment manufacturing; General equipment manufacturing (excluding special equipment manufacturing); Mechanical and electrical equipment manufacturing; Mechanical equipment research and development; Mechanical equipment sales; Mechanical parts and parts processing; Mechanical parts and parts sales; Mold manufacturing; Mold sales; Metal material sales; Coal and product sales (raw coal, bulk coal, gangue, coal slime, pulverized coal, coal water slurry, briquettes, coke, blue charcoal, etc. shall not be contained in the no-burn zone); software development