Actually there is an official Central Government translation of said law.

If you've been issued your Z visa and have been issue a foreign expert certificate - that is all you need to begin your teaching job. There is legally, a 30 day window to obtain your Resident Permit - which entitles you to live (reside) in China DURING your legal employment. The R.P. is not your permission to work. Despite what people think, that's not legally the case.