双色球红蓝走势图

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在做半导体时石英坩埚要套上石墨坩埚的原由

发布时间:2019-09-23 14:00:10 浏览:158次


    只是会增加热阻,你放东西进去加热效果会变得很差。当然假如你套得十分十分紧的话,加热后石墨坩埚可能会裂开。石墨坩埚会在酒精灯上发作熄灭,石英坩埚因受热不均可能会招致呈现裂痕。


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