“permissible exposure limit”的概念、定义、翻译、参考文献-科学参考

单词	permissible exposure limit
释义	permissible exposure limit [pǝr¦mis·ǝ·bǝl ik`spō·zhǝr ´lim·ǝt] ^{INDUSTRIAL ENGINEERING} The level of air contaminants that represents an acceptable exposure level as specified in standards set by a national government agency; generally expressed as 8-hour time-weighted average concentrations. Abbreviated PEL.
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