hai dây dẫn bằng nhôm có cùng tiết diện 1 và y dài 2 m có điện trở r1 và dây kia dài 6 m có điện trở r2 tính tỉ số r1 r2

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.

the answer to this is proletariats.

hope this : )