Utilize the input text as a context reference, choose the right relationship between Sinopec and Beijing from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

Inspectors carrying out the safety reviews in Beijing found that security personnel at a branch of Sinopec Corp, Asia's largest refiner, were unfamiliar with how to handle an oil tank fire, Xinhua said.

Answer: headquarters_location