“铅污染”的概念、定义、翻译、参考文献-科学参考

单词	铅污染
释义	铅污染 Encyclopedia 工学铅污染释 pollution by lead铅污染人类生活和生产活动中排放的铅及其化合物进入环境并超过环境质量标准限值或造成生物生态危害影响的现象。
随便看	positive real system positive recurrent point positive recurrent state positive reinforcement positive relation positive result positive root positive root system positive rotation positive school of criminology positive selection positive self-adjoint operator positive self-regard positive semi-definite positive semi-definite form positive semi definite Hermitian matrix positive semi-definite Hermitian matrix positive semi-definite kernel positive semi definite matrix positive semi-definite matrix positive semi-definite operator positive semi definite quadratic form positive semi-definite quadratic form positive semi-definite rational function positive semigroup

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