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namsieunhan
2 năm trước
Một máy hoạt động với công suất 1,2kW để nâng vật lên cao 10m. Hỏi thời gian để nâng vật lên là bao nhiêu? Biết vật có khối lượng 90Kg và hiệu suất của máy là 75%
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