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Physics, 31.07.2021 17:50 aaron2113

Quan sát dưới gầm ôtô chở xăng bao giờ ta cũng thấy một dây xích sắt. Một đầu của dây xích sắt này được nối với vỏ thùng chứa xăng, đầu kia được thả kéo lê trên mặt đường. Dây xích này được sử dụng như thế để làm gì? Tại sao?

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