ppm ['pi:p'i:'em]以下由轻松背单词网站提供
单词级别附加级基本释义abbr. 百万分率,百万分之…(parts per million)参考例句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。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。 推荐阅读 |