Many people's impression of chemical industry is still the high pollution and high alkali damage of chemical plants, but in fact, the relationship between mankind and chemical industry is very close. Some chemical products have played an epoch-making important role in the history of human development. Their production and application , Even represents a certain historical stage of human...
English 
Arabic
French
Spanish
Portuguese
Deutsch
Turkish
Dutch
Italiano
Russian
Romaian
Portuguese (Brazil)
Greek