About the company regulations issue, that's really an old topic.
The Labor Contract Law Article 4 has a clear provision:
When an employer formulates, amends, or decides on regulations and major issues directly related to the employees' personal interests such as labor remuneration and working practices, they must discuss and propose plans and opinions through the workers' congress or all employees, and determine them through equal negotiation with the labor union or employee representatives.
Similarly, these provisions that directly affect the employees' personal interests must be made public or known to the employees.
Nowadays, even slightly formal companies are handling this "well".
For instance, many workers sign a lot of documents when they join, which include notifications about these regulations.
They just bring them over for you to sign, you sign and then you get to work, and if you don't sign, you can't work; so, basically, everyone signs.
