1. What is the shelf life of 3M's filtering facepiece respirators?
   3M随弃式呼吸防护口罩的存放期是多长时间？
2. 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，请在要求的压力下，穿保护衣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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