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Penjual air keliling membantu warga untuk memenuhi kebutuhan air bersih. Saat ini method perpipaan air bersih untuk warga terhambat oleh terbatasnya sumber bahan baku. The optical pyrometer is useful for measuring the temperature on the furnaces, molten metals, as well as other overheated product or liquids. , yaitu suatu senyawa sederhana yang b