能长久地保留磁性的磁体叫磁体，它有磁体和__磁体两种

能长久地保留磁性的磁体叫______磁体，它有______磁体和______磁体两种。

答案

永、天然、人造

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能长久地保留磁性的磁体叫______磁体，它有______磁体和______磁体两种

答案

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能长久地保留磁性的磁体叫磁体，它有磁体和__磁体两种