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5 Bahan Cemar Udara

Udara yang kita sedut mungkin mengandungi bahan yang berbahaya yang boleh memberi kesan kepada sistem pernafasan kita. Bahan pencemar ini memberi kesan besar kepada kita jika tidak ambil langkah penjagaan yang baik. Antara bahan-bahan pencemar yang boleh membahayakan sistem respirasi kita adalah:Asap...

By: miecaprio

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