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Câu 21:

Nung thép đã tôi ở nhiệt độ $80 \div {200^o}C$

Câu 21: Nung thép đã tôi ở nhiệt độ 80÷200oC80 \div {200^o}C80÷200oC thì:

Thông tin câu hỏi

Câu 21:

Nung thép đã tôi ở nhiệt độ $80 \div {200^o}C$ thì: