Method: Sample was refluxed with ethanol in a water bath .
方法：采用乙醇做溶剂，水浴加热回流提取。
2
Effects of mole ratio of 1, 2- ethanedithiol to isovaleraldehyde, amount of catalyst and refluxed time were investigated.
研究了乙二硫醇与异戊醛物质的量比、催化剂用量、反应时间等因素对反应收率的影响。
3
This paper studies the character of smoke by fire model test in tunnel, emphasizes on the law of smoke distribution t analyses the length, velocity and thickness of refluxed zone.