ppm的读音 ppm中文意思
英音
['pi:p'i:'em]
美音 ['pi:p'i:'em]
abbr. part per million 百万分之…美音 ['pi:p'i:'em]
ppm 用法和例句
- Concentrations of 10 ppm can be endured for only a few minutes and cause profuse lacrimation in all people .
- 10ppm的浓度，只需几分钟，就会使所有的人流泪不止。
- It has a repulsive acidic odor that can usually be detected at or below a concentration of 5 ppm .
- 它有一种另人厌恶的酸味，在浓度为5ppm或以下可以察觉到。
- Type I Diabetes mellitus usually starts from adolescent , whose morbidity rate is about 83 ppm and still increases .
- I型糖尿病主要累及青少年，患病率万分之0.83，还在不断增长。
- By chance , oryza sativa is a like aluminum plant , its optimum concentration is 30 ppm was observed .
- 意外观察到水稻是喜铝植物，最适浓度是30ppm。