英语词汇“ppb”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

> as lemmas

ppb

ppb n. (also P.P.B.) parts per billion.

ΚΠ

1929 Science 21 June 651/1 (table) Iodine in Plants..Feedstuffs..No. of Samples..P.P.B. iodine av.

1956 J. Cholak in P. L. Magill et al. Air Pollution Handbk. xi. 10 The normal fluoride content of the atmosphere is extremely low (2 to 8 ppb).

1990 C. Rose Dirty Man of Europe (BNC) 120 During 1976, when the weather was warm and dry, record-breaking ozone levels were detected, reaching over 200 ppb and exceeding 60 ppb on half the summer days.

extracted from Pn.

as lemmas

单词	ppb
释义	> as lemmas ppb ppb n. (also P.P.B.) parts per billion. ΚΠ 1929 Science 21 June 651/1 (table) Iodine in Plants..Feedstuffs..No. of Samples..P.P.B. iodine av. 1956 J. Cholak in P. L. Magill et al. Air Pollution Handbk. xi. 10 The normal fluoride content of the atmosphere is extremely low (2 to 8 ppb). 1990 C. Rose Dirty Man of Europe (BNC) 120 During 1976, when the weather was warm and dry, record-breaking ozone levels were detected, reaching over 200 ppb and exceeding 60 ppb on half the summer days. extracted from Pn. < as lemmas
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