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The hard disk is covered with a thin coat of magnetic material.
硬盘被一层薄薄的磁性材料覆盖着。
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Material was transformed soft magnetic property into hard magnetic property.
这说明随着球磨时间的增加，材料由软磁性向硬磁性转化。
youdao
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Material was transformed soft magnetic property into hard magnetic property.
这说明随着球磨时间的增加，材料由软磁性向硬磁性转化。
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