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An airplane of China Eastern Airlines, one of China's three major commercial carriers, Oct 30. [Photo/IC]
An employee of subsidiary of China Tower Corp in Chengdu checks equipment in Chengdu, Southwest China's Sichuan province, April 20, 2017. [Photo/VCG]
An employee rides a horse through a beef cattle pen during twice-daily health and safety inspections at the Texana Feeders feedlot in Floresville, Texas, US. [Photo/Agencies]
Among top 500 firms, the key technologies of 402 companies were mainly developed independently, accounting for 80.4 percent of the total. The number of valid patents obtained by the top 500 firms increased by 8.46 percent in 2019, while the figure for international patents also grew significantly.
An investigation team said firefighters have properly handled the explosion scene and isolated a tank nearby the explosion spot. The fire has been put under control.
