commanding quarantine stations and enlisting more than 250 doctors into the Public Health Service to fight the Spanish flu, particularly notable at a time when the nation’s ranks of medical professionals had been depleted by World War I.
nearly two decades later,in 1971,that US engineer George Laurer perfected the technology and a move toward its commercialization began. On April 3,1973,the standard to identify(2) products(product) was agreed on by a number of large retailers (零售商) and food companies.The...
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