Provides the theoretical data for the vacuum degassing purification and vacuum dry of liquid medium.

为液体介质的真空脱气净化和真空干燥提供了理论数据。

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Purifying selenium by vacuum distillation. Metal selenium purification is on the base of different elemental volatility.

真空蒸馏提纯硒利用元素的挥发性不同进行金属硒的提纯。

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Then the view is not large, to choose a pump, plus some oil purification measures, such as the Canadian cold trap, baffle, retaining the oil wells, but also in order to reach a dirty vacuum.

那末务求不宽大，能够取舍有油泵，加上一些防油净化措施，如加冷阱、障板、挡油阱等，也能达成肮脏真空务求。

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