What happened to Yanjing beer produced in xian county, Cangzhou?

This situation shows that there are quality problems in beer.

It is not normal to pour beer without foaming. A good bottle of beer bubbles when poured into a clean glass. There is an evaluation standard of beer quality grade called foamability, that is, the duration of foam.

The foam standard of beer above the top grade is 180 seconds, and the foam duration of beer is short or no foam, which basically shows that the quality of this wine is not very good.