A collection of specified quantities and qualities of various types of goods and services. A price index is constructed by measuring changes in the total cost of buying a given bundle of goods, whose composition depends on the purpose of the index.
科学参考收录了60776条科技类词条,基本涵盖了常见科技类参考文献及英语词汇的翻译,是科学学习和研究的有利工具。