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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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更新时间：2026/6/16 13:50:06