A magnet has two poles, north pole and south pole.
A paper clip is magnetic.
an eraser is non-magnetic.
Like poles repel.
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https://www.getepic.com/sign-in 1.點選黃色圈起來的連結 2. 輸入課程代碼 nsy0771 看完一本書別忘了做測驗 stationery dragon game https://www.eslgamesplus.com/school-supp...
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