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单词 parts per million
释义
parts per million
noun[plural]
MEASURES
uk
us
→ppm
(Definition ofparts per millionfrom theCambridge Business English Dictionary© Cambridge University Press)

Examplesofparts per million

parts per million
One micromolar is approximately 0.115partspermillion.
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Wheat and corn contain seven and threepartspermillionrespectively.
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In rats subjected to a two-year feeding study, no observable effect was seen at 100partspermillion(ppm).
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Ozone concentrations are greatest between about 20and40 km, where they range from about 2 to 8partspermillion.
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The huge quantities of nickel ore processed makes up for the fact that platinum makes up only twopartspermillionof the ore.
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The acceptable level has been raised to tenpartspermillionfor ephedrine and twenty-fivepartspermillionfor other substances.
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Near its mouth, the concentration is 28partspermillion.
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Water chemists measure water impurities inpartspermillion(ppm).
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The report said that carbon dioxide levels in the soil averaged about 23,000partspermillion, several times higher than is normal for the area.
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In areas affected by acid mine drainage, the sulfate concentration ranges from 37 to 1375partspermillion.
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These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.
#https://dictionary.cambridge.org//dictionary/english/parts-per-million##
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更新时间：2024/12/28 0:28:11