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What is the shelf life of 3M's filtering facepiece respirators?

3M随弃式呼吸防口罩的存放期是多

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In the event of a fire, wear full protective clothing and NIOSH-approved self-contained breathing apparatus with full facepiece operated in the pressure demand or other positive pressure mode.

如果发生火灾,请要求的压力下,穿和国立职业安全与健康研究所批准的呼吸器械和口罩。

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