I used up 30 vinegar to soak my feet at home. Today, I had to go to Jinfeng wholesale market in the side street. I asked three companies and said no. When I asked about the fourth one, the female boss said "Yes" was a brand of "Vinegar Essence" produced locally in Kunming. The word "30" is indeed written in the upper right corner, but I see that the acid content in the component column is 3.5g/ 100mL. Why is it only 3.5 degrees? The "smart man" in his forties who bought cheap vinegar next to him (I don't know his name, let's call him "Gong Ming") began his speech in Southwest Mandarin: "The acid content should not exceed 4, and if it exceeds 4, it will become hydrochloric acid, which will hurt people. To be honest, I can't hear whether he said 4 or 10, but one thing is certain, he can basically distinguish hydrochloric acid. I smiled and said, "Really? ! That "Gong Ming" said more firmly: "If it exceeds 4, it will definitely become hydrochloric acid! "I had no choice but to walk to the next booth. I asked several booths and finally bought 30 yuan of vinegar. Although I am happy, I am a little worried. I think he can catch up with nine-year compulsory education. How did this happen? Now that compulsory education has been upgraded to 12 years, will people who have received 12 years of compulsory education do so after graduation?