Where do state-owned enterprises and large formal private enterprises generally publish recruitment information?

Companies like the one you mentioned generally do not publish recruitment information on recruitment websites.

Recruitment websites generally publish information about positions contracted by small companies. You can either be an outsourced worker or a labor dispatcher.

Only by entering their company’s official website can the talent recruitment on it be real, and only by entering can you get a formal job. But large companies generally recruit on campus. There are very few social recruiters, and basically all of them are not regular workers (except for those with connections).