Transformer, rectifier and inductor manufacturing; Pharmaceutical special equipment manufacturing; Pharmaceutical special equipment sales; Oil refining and chemical production special equipment manufacturing; Oil refining and chemical production special equipment sales; Mechanical and electrical equipment manufacturing; Mechanical and electrical equipment sales; Electronic (gas) physical equipment and other electronic equipment manufacturing; Experimental analytical instrument manufacturing; Experimental analytical instrument sales; Environmental protection special equipment manufacturing; Environmental protection special equipment sales; Daily necessities wholesale; Daily necessities sales; Office supplies sales; Household appliance sales; Metal product sales; Labor protection product sales; Textile product sales; Textile, clothing and household goods wholesale; Plastic product sales; Glass instrument sales; Rubber product sales; Food plastic packaging container tool product sales; Paper product sales; Class I medical device sales; High-performance sealing material sales; Stationery wholesale; Class II medical device sales; Hand cart and livestock traction vehicle sales; Instrument and meter sales; Electronic measuring instrument sales; Utility instrument sales; Intelligent instrument sales; Hardware product wholesale; Spray gun and similar appliance sales.