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oopsphong1501
2 năm trước
Khi lắp khâu vào cán dao, người thợ rèn phải nung nóng khâu rồi mới tra là vì: A. Chu vi khâu lớn hơn chu vi cán dao B. Chu vi khâunhỏ hơn chu vi trắng dao C. Khâu co dãn vì nhiệt D. Một lý do khác
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