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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.Follow Waterproof casing honest cooperative enterprise Zhongyuan valve fittings Washington, D.C online promotion sub-station to learn the common Washington, D.C regional knowledge: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., 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.Waterproof casing 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 Waterproof casing customers, which can provide reasonable Waterproof casing aviation solutions for Washington, D.C Waterproof casing customers!