1, Public finance,also known as public sector economics or public economics, focuses on the taxing and spending activities of government and their influence on the allocation of resources and distribution of income. 财政学,即公共经济学,焦点是税收和政府支出以及它们在分配资源和分配收入上的影响
Crystallization is one of the oldest methods known for recovering pure solids from a solution. The Chinese, for example, were using crystallization to recover common salt from water some 5000 years ago. The perfection and beauty of the crystal which fascinated the early tribes now leads to a product of high purity and attractive appearance