“ppm”的概念、定义、翻译、参考文献-科学参考

单词	ppm
释义	ppm Chemical Engineering An abbreviation for parts per million. That is, the number of parts of something per million parts in total. It is often used as a measure of the level of impurities in solids, liquids, and gases. Computer Abbrev. for pages per minute. Geology and Earth Sciences Parts per million.
随便看	social laws social market economy social media social media forum social mobility table social network social network service social opportunity cost social optimum social overhead capital social philosophy social physics social planner social polarization social purpose company social reproduction social returns to education social safety net social science, philosophy of Social Security Act social security benefits social security contributions social services social software social space

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。