ppm助记

ppm

['pi:p'i:'em]

abbr.part per million 百万分之…;

例句:

1、

Cl ~ -- supply of 3200 ppm even has a more serious effect.

施氯3200ppm时,不利影响更为严重.

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2、

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.

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3、

The legal limit of melamine in Hong Kong is 2.5 ppm.

在香港,产品的三聚氰胺含量法定上限为百万分之2.5.

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