In the past two days, someone came to the village and said that it was the superiors from Shunyi Gas Company who checked the gas: Is it a coincidence that they modified the gas stove for us?

You can call your local gas company and ask. Under normal circumstances, gas companies will not sell stoves and other items when checking gas, and they will not charge for repairs. If your stove has a hidden danger, someone from the gas company will tell you and let you buy a new stove instead of selling his stuff. If he says that there is a problem with your hood and stove and you need to replace it with his, don’t believe it, he is definitely a liar