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nguyenquocdatthcsphumy7a1
2 năm trước
1.làm vật nhiễm điện bằng cọ sát 2. hai biểu hiện của các vật đã nhiễm điện 3. quy ước điện tích của thanh thủy tinh,thanh nhựa sau khi cọ xát 4. tương tác giữa 2 vật mang điện,nêu đc đó là hai loại điện tích gì.
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