回复:请指教博士后办绿卡到底要什么公证?
your PhD certificate if it was awarded in China.This is needed for the first step of your 140.
You will need notary of your birth and non-crime from China in the future when submitting your 485.
suggest you do some homework before ask questions here. Better to find one GC DIY package and know all of the procedures, or hire a lawyer.