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Câu 14. Hãy giải thích tại sao trên các cánh quạt điện trong gia đình thường bám bụi? Câu 15. Một người muốn mạ bạc cho cái nhẫn đồng. a) Phải dùng dung dịch gi? b) Thanh nối với cực âm của nguồn là cái gì? Thanh nối với cực dương của nguồn làm bằng chất liệu gì? Vì sao phải bố trí như thế? Làm ơn giúp đi mà nhanh
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