在竖管炉中用石墨坩埚进行还原试验。
Reduction experiments have been conducted in a vertical tube furnace using graphite crucible.
介绍了近年来在制作回转管炉、四管还原炉的技术进步；
Technical improvement of making rotary tube furnace, tetrode reduction furnace in recent years is described.
真空电阻炉用加热元件、空感应炉用各种石墨元件、管炉用的加热管。
The tubular-cased heating element is the same type as those used in cook stoves.
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