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cindynguyen835
2 năm trước
một người dùng mặt phẳng nghiêng để đưa một kiện hàng nặng 100 kg từ dưới đất lên sàn xe tải. Người đó dùng một lực kéo tối thiểu là : a. F<1000N b.F=1000N c.F>1000N d.F=2000N
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