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- Tie ng o n: pha n x ng luye n trong giai oa n no ng cha y co m c o n cao nha t lo luye n, 84 -110 dBA.

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- Tie ng o n: pha n x ng luye n trong giai oa n no ng cha y co m c o n cao nha t lo luye n, 84 -110 dBA.

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