ppm
「ppm」的意思
abbr. 百万分率，百万分之……（parts per million）
part per million 百万分之...;papers per minut,每一分钟内可以打印的页数
「ppm」的用法
ppm每百万 - 用于表示浓度或比例，特别是在环境监测和化学分析中。
「ppm」的例句
The air quality index in the city is 50 ppm.
城市空气质量指数为50 ppm。
The concentration of lead in the water is 10 ppm.
水中的铅浓度为10 ppm。
The ppm level of carbon monoxide in the room is safe.
房间内的一氧化碳ppm水平是安全的。
The ppm of sulfur dioxide in the air has decreased.
空气中二氧化硫的ppm水平已降低。
The ppm level of nitrogen oxides in the atmosphere is high.
大气中氮氧化物的ppm水平较高。
The ppm concentration of benzene in the soil is below the limit.
土壤中苯的ppm浓度低于限值。
The ppm level of ozone in the stratosphere is increasing.
平流层中臭氧的ppm水平正在增加。
The ppm concentration of formaldehyde in the building is within acceptable limits.
建筑内甲醛的ppm浓度在可接受范围内。
The ppm level of particulate matter in the air has reached a critical point.
空气中颗粒物的ppm水平已达到临界点。
The ppm concentration of ammonia in the soil has been measured.
土壤中氨的ppm浓度已被测量。