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lanyeuduynhat
2 năm trước
a) Có mấy loại điện tích? Nêu qui ước điện tích? b) Đưa một thước nhiễm điện âm lại gần một thanh thuỷ tinh sau khi đã cọ xát vào lụa thì có hiện tượng gì xảy ra? Giải thích?
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