Chemistry is the most useful and creative science of the 21st century, China's four ancient chemical processes , ...

Test analysis: China's ancient four major chemical processes for the manufacture of bronze, iron smelting, the invention of gunpowder, porcelain firing.

Comments: The examination is often in the multiple-choice questions and fill in the blanks in the examination of general knowledge of chemistry, every year, students should pay attention to more accumulation and summarization of their studies in the usual.