vacuum purification的意思|示意

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。

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。

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。