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  • The cathode at the left is raised to a high temperature by the heater, and electrons evaporate from its surface.

    左边的阴极被灯丝加热到高温，同时电子从阴极表面蒸发出来。

    youdao

  • The cathode at the left is raised to a high temperature by the heater, and electrons evaporate from its surface.

    左边的阴极被灯丝加热到高温，同时电子从阴极表面蒸发出来。

    youdao

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