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Los equipos de protección respiratoria del tipo autofiltrante o dependientes del medio ambiente sólo pueden utilizarse si se alcanza;a) Más del 10 % de oxígeno en aire.b) Más del 12 % de oxígeno en aire.c) Más del 15 % de oxígeno en aire.d) Más del 17 % de oxígeno en aire.

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