本发明的特点是：金属氧化释放出热能，使用方便，工艺简单， 成本低廉，热量释放可控。

This invention has such characteristics as easy usage, simple process, and controllable heat release.

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甚至成本是可控的。

And even then the costs are manageable.

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甚至成本是可控的。

And even then the costs are manageable.

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