请输入您要查询的英文单词:
单词
ppb
释义
ppb
in American English
parts per billion
Examples of 'ppb' in a sentence
ppb
Concentrations of methane have risen from 700 parts per billion (ppb) to 1,745 ppb.
Times, Sunday Times
(
2009
)
Laboratory analysis is done on samples that are 100 ppb and below using atomic absorption spectrophotometry.
The Scientist
(
2000
)
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magnetically
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magnetic anomaly
magnetic axis
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magnetic constant
magnetic course
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magnetic dipole moment
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magnetic drum
magnetic epoch
magnetic equator
magnetic field
magnetic-field
magnetic field strength
magnetic flux
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更新时间:2025/7/12 4:36:40