双色球红蓝走势图

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双色球红蓝走势图 13972952686

为什么常见的石墨加热器都是电阻式的?

发布时间:2019-11-06 18:19:47 浏览:56次

    石墨是很纯的物质,石墨是过渡型晶体。每一层石墨里碳原子以非极性共价键相联,石墨分子层之间又靠分子间作用力联接。其的熔点是3652度~3697度(升华),所以石墨坩埚耐高温。石墨在绝氧条件下的燃点至少在3000度以上,空气中的燃点就更高,空气中如此高温度的火种没有,所以石墨不能点燃。木炭除含碳素外,还含有氢、氧、氮以及少量的其他元素,木炭中的碳也不是像石墨一样的过渡型晶体,而是无定形的碳。


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