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Washington, D.C. is one of the few modern large cities in the world that only focus on the administrative functions of the government. There is no industry in Washington, D.C., and the economic sources are the federal government grants and its agency expenditures, professional industries and commerce, tourism, etc., in addition to tourism, real estate transactions, information services, education, hotels, media and other service industries. The science and technology industries in Washington, D.C. include information technology, telecommunications and biotechnology. Among the economic sources of Washington, D.C.North America Expansion joint partner Zhongyuan valve fittings Washington, D.C multinational business promotion site make up more Washington, D.C regional knowledge:, the first is the allocation of federal government and the expenditure of its agencies, with a contribution rate of 33.9% to GDP. Professional industries and businesses ranked second, accounting for 24.2% of GDP.Expansion joint service provider Zhongyuan valve fittings is located in the Eurasian continental plate, bordering the Pacific Ocean, and shipping is convenient. Zhongyuan valve fittings has a service team for North America Expansion joint customers, which can provide reasonable Expansion joint coal gas solutions for Washington, D.C Expansion joint customers!