英语词源
- ppm
- abbreviation of parts per million, attested by 1913.
权威例句
- 1. The term parts per million ( ppm ) was widely used but frequently led to misinterpretation.
- 广泛使用百分之几 ( ppm ) 表示结果,但常常引起误解.
- 2. Note: PPM means part per million usually a measure of quality.
- 注: PPM是百万分之一件的缩写通常是质量的一种指标.
- 3. Objective : To study implement effect of PPM - tuberculosis control project in city.
- 目的: 探讨在城区实施PPM-DOTS项目的效果情况.
- 4. This article presents a class for using PPM to compress a file.
- 本文介绍了使用PPM的压缩文件一类.
- 5. Probabilistic Packet Marking ( PPM ) is an efficient and practical scheme.
- 概率包标记 ( PPM ) 是一种比较有效且实用的解决方法.