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<td class="thead" colspan="5" align="center"><strong> عوامل فیزیکی Physical agents</strong></td>
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<td class="thead" colspan="5" align="center"><strong> عوامل شیمیایی Chemical agents</strong></td>
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<td class="thead" colspan="5" align="center"><strong> عوامل مکانیکی Mechanical agents</strong></td>
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