I think that's a NOPE as far as I know (we have a food license).
I have seen the letter grading, with many many of places that had a "B" which would have gotten a D or E in the US and shut down in Europe.
I have been to some expensive places in Kunming, and yet have to find a place with an "A" rating.
On a side note, I am careful WHERE to eat (see my post above).
I'm doing most on low-budget at local small rice and noodle places and restaurants, but the count at the moment is:
Foodpoisoning: Los Angeles 2.5 - Kunming 0