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- During the course of the experiment, the student will be exposed to fractional distillation under vacuum, gas chromatography, refractometry, polarimetry, and IR absorption spectroscopy. 气相色层分析，折光率的测定，旋光度的测定和红外吸收光谱。
- distillation under vacuum 真空蒸馏
- Methods: Second-hydrogenation, distillation under high vacuum, recrystallization, hydrolyza-tion under acid condition, and oxidation. 方法:再次氢化、酯化物高真空蒸馏、成盐后重结晶、酸性条件下水解、氧气破坏性氧化。
- After microtomy the sulphur is sublimed away under vacuum. 在完成切片后，可在真空下将硫升华除掉。
- Brazing of stainless steel under vacuum or protective atmosphere. 不锈钢真空或保护气氛钎焊。
- Resin was degassed using a vacuum and the winding carried out under vacuum. 树脂用真空脱气，并在真空下进行缠绕。
- Brazing of copper and nickel under vacuum or reducing protective atmosphere. 铜和镍的真空或还原保护气氛钎焊。
- Usually in polyethylene-aluminnum composite bags packed under vacuum. 通常为铝塑复合包装袋，真空式充氮气包装。
- Heavy wall, translucent Buchner flasks, suitable for use under vacuum. 为半透明之厚壁过滤锥形瓶。
- Resin was degassed using a vacuum and the winding carried out under vacuum . 树脂用真空脱气，并在真空下进行缠绕。
- The technological process of making aniseed oil by vapour distillation under normalpressure in industry, chief equipment and producing steps are also described in tetait. 并详细阐述了工业生产上在常压下用水蒸气蒸馏法来制取大茴香油的工艺过程、主要设备和生产步骤。
- Do not energize under vacuumed condition. 在真空状态下请勿通电;
- Plastics piping systems - Systems for hot and cold water - Test method for leaktightness under vacuum. 塑料管道系统。热水和冷水系统。真空密封性的检验方法。
- Some questions on process designment and project practice of the miscella evaperation under vacuum are described. 探讨了混合油负压蒸发二次蒸汽利用工艺设计和工程实践中应注意的几个问题。
- The carriers in the material can be characterized by properties in many ways comparable to those of free electrons under vacuum. 这种材料中的载流子，许多特性都差不多可用真空中的自由电子的特性来表征。
- Taking soybean oil as raw material,the vehicle of soy ink was synthesized by heat polymerization under vacuum technology. 以大豆油为原料,通过真空负压工艺下的热聚合反应合成大豆油墨连接料。
- For cylinders equipped with residual (positive) pressure valves, one evacuation under vacuum at 150 millibar is sufficient if the pressure is positive. 对于装有剩余压力阀门的气瓶，如果瓶内剩余压力是正压，把它抽真空到150mbar以下就可以了；
- distillation under reduced pressure 减压蒸馏
- distillation under normal pressure 常压蒸馏
- Containers sealed under vacuum should be tested for maintenance of that vacuum after an appropriate, pre-determined period. 在真空条件下密封的容器，应该在适当的预先确定的日期后检查真空保持度。
