ﺗﻌﻠﻴﻤﺎت اﻟﺴﻼﻣﺔ
اﺳﺘﺨﺪام ﺷﻔﺎط اﻟﺒﻮﺗﺎﺟﺎز اﻟﺨﺎص ﺑﻚ
اﺳﺘﻜﺸﺎف اﻷﻋﻄﺎل وإﺻﻼﺣﻬﺎ
اﻟﺼﻴﺎﻧﺔ واﻟﺘﻨﻈﻴﻒ
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اﻟﺘﺮآﻴﺐ
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ﺑﺪء
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ﺣﻤﺎﻳﺔ اﻟﺒﻴﺌﺔ
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اﻟﻤﺤﺘﻮﻳﺎت
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