When sampling, the speed of sample gas is similar to the actural pipe gas by controlling the sample gas flow.
取样时通过控制采样流量，使样气流速模拟取样点管道中煤气流速达到等速取样的条件。
Fast speed and great changes are the characteristics of the initial desorption gas course from coal, so it is difficult to measure the initial desorption gas flow from coal sample.
煤样中瓦斯的初始解吸过程的特点是速度快、变化大，初始解吸的瓦斯流量难以检测。
The effects of nitrogen flow as carrier gas, impurities , sample size and temperature on rate of dehydrochlorination of HPVC were investigated comprehensively.
探讨了氮气流量、低分子杂质、试样的形状、温度等因素对HPVC树脂热脱氯化氢速率的影响。
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