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What is the latest requirement for detection of high-iron nucleic acid in Anqing?

It takes 48 hours for nucleic acid to be negative. Official website, Anqing Municipal People's Government, inquired that the latest requirement for high-iron nucleic acid detection is to hold a 48-hour negative nucleic acid certificate. High-speed railway, referred to as high-speed railway, refers to a railway system with high design standards and fast train running speed. Its concept is not limited to tracks, let alone trains.