ppm是什么意思,ppm怎么读 语音:
英音  ['pi:p'i:'em] 
美音  ['pi:p'i:'em] 
ppm 基本解释
abbr. part per million 百万分之…
ppm是什么意思
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ppm 用法和例句提示:点击例句中的单词,就可以看到词义解释
提示:点击例句中的单词,就可以看到词义解释
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。