Cov lauj kaub cam khwb cia muag tau ua noj ua haus hauv Suav teb vim nws lub zog siab, kev lag luam hlau, kev lag luam hlau, kev lag luam thiab kev khwv nyiaj txiag.Txawm li cas los xij, cov lauj kaub hlau hlau tawm tam sim no ntawm kev ua lag luam yog txhua hlau cam khwb cia hlau lossis cov hlau rov ua dua tshiab.Lub ntsiab ntawm cov hlau cam khwb cia: carbon (c) = 2.0 rau 4.5%, silicon (...
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