https://www.krqcitie.com/cjwt/804.html
很多人都不了解的磁钢跟磁铁的相同点及区别
https://www.google.com/search?q=%E7%A3%81%E9%8B%BC+%E7%A3%81%E9%90%B5&rlz=1C1VDKB_zh-TWTW1028TW1028&oq=%E7%A3%81%E9%8B%BC&gs_lcrp=EgZjaHJvbWUqCAgBEEUYJxg7MgYIABBFGDsyCAgBEEUYJxg7MgcIAhAAGIAEMgcIAxAAGIAEMgwIBBAAGEMYgAQYigUyBwgFEAAYgAQyBwgGEAAYgAQyBggHEAAYHjIGCAgQABgeMgYICRAAGB7SAQgzMDE5ajBqNKgCALACAA&sourceid=chrome&ie=UTF-8
