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Is Wuxi's human resources reliable?

The above-mentioned human resources companies don't know much about it, but generally speaking, formal third-party companies (such as headhunting human resources outsourcing, etc. ) don't charge job seekers, usually sign contracts with enterprises. Of course, some human resources organizations will accept money from both sides, but this kind of thing is "selling people" in plain English. Do you think it is reliable?