As the Spring Festival is approaching, the epidemic situation is one after another, which has not been completely eliminated. According to the requirements of relevant government documents, we should make a good deployment of epidemic prevention work for the returned personnel, that is, the returned personnel need to return home with the negative results of effective nucleic acid test of new coronavirus within 7 days
Do you know how sand becomes glass? How does the color of glass come from? The ancient Egyptians were the earliest glass manufacturers in the world. Glass has been used in human life for more than 4,000 years. About 2,000 years ago, Syrian craftsmen invented the glass blowing technique. Glass bottle container made by blowing air. The main component of most glass in life is sand. Sand is composed of silicon di
In recent years, milk tea shops have increased. You will find at least five milk tea shops in a mall. What caused this phenomenon? According to the report, more than 80% of people drink some milk tea in their leisure time. Milk tea is their favor, which is why milk tea shops have risen in a short period of time. But milk tea often adds too much sugar and creamer. In the long run, this is not good for our health. How
Glass products are everywhere. We use all glass products for windows, vases, glass, and even blender jar. But do you know what glass is? Glass is an amorphous inorganic non-metallic material, generally made of a variety of inorganic minerals (such as quartz sand, borax, boric acid, barite, barium carbonate, limestone, feldspar, soda ash, etc.) as the main raw material, and a small amount of auxiliary raw materials a
