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hoangkhuongduy59
2 năm trước
người ta dùng mấy nâng hàng để nâng một kiện hàng có khối lượng 750kg lên cao 6m trong 10 giây a) tính công thực hiện b) tính công suất của máy nâng hàng c) dùng mấy nâng hàng có công suất trên để đưa một kiện hàng khác lên cai 4m mất 12 giây,tính trọng lượng thùng hàng
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