英语语法分析

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。

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。

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.

通过对隧道火灾模型试验，研究隧道发生火灾时烟流性态，着重对隧道内的烟流扩散规律、烟流逆流层的长度、逆流速度、逆流层厚度进行了试验数据的分析。