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Cuando queremos comparar los resultados del muestreo con un valor VLA--EC:a) debemos tomar muestras de larga duración.b) compararemos el periodo de 15 minutos de mayor concentración.c) tomaremos muestras de mínima duración y la más alta es la que consideraremos.d) siempre debemos utilizar muestras ambientales por ser más significativas.

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