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Always be very careful, because the magnets will stick together by themselves and may pinch your fingers. When the magnets ar...2021-11-25
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Magnetic materials are ancient and widely used functional materials. The magnetic properties of materials were known and appl...2021-11-25
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1.MagneticExperiments show that any substance can be magnetized more or less in an external magnetic field, but the degree of...2021-11-25
