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Avtardung1962
2 năm trước
Để kéo một thùng nước có khối lượng 20kg từ dưới giếng lên bằng rr cố định, người ta phải dùng lực nào trong các lực sau A. F<20N B.F =20N C.20N<F<200N D.F>200N.
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