They should restrict access to areas where exposure limits may be exceeded.
应限制进入可能超过接触限度的地区。
For some harmful gases, it is suggested to classify their exposure limits based on altitude.
对于一些有害气体，建议按海拔细分其接触限值。
The occupational exposure limits (OELs) of wood dust in different countries are however not the same.
不同国家的木粉尘的职业接触极限值（或极限值）却不尽相同。
The present paper presents the action needed, occupational exposure limits for control silicosis, and finally introduces the ILO/WHO International Program on Global Elimination of Silicosis.
本文就所需要采取的措施．职业接触限值陈述了目前国际上的趋势，最后介绍了ILO／WHO全球消除矽肺的国际规划。
The safety exposure limits proposed by scholars at home and abroad were introduced in this review. Standards for safety exposure limits to constant magnetic field need to be considered and set.
介绍了国内外学者提出的恒定磁场暴露的安全限量，认为有必要制订相关的暴露限量标准。
The safety exposure limits proposed by scholars at home and abroad were introduced in this review. Standards for safety exposure limits to constant magnetic field need to be considered and set.
介绍了国内外学者提出的恒定磁场暴露的安全限量，认为有必要制订相关的暴露限量标准。
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