前言我国从六十年代起,利用集气式岩芯采取器在钻孔中取芯,进行煤层瓦斯含量的测定。多年来的实践表明,该方法虽然在生产中已广为应用,但是(干心)到仍然比较复杂,如果使用不当,得出的资料不够可靠,试验数 Foreword Since the 1960s, China has used the core collector to collect coring in the borehole to measure the gas content in the coal seam. Practice over the years shows that although the method has been widely used in production, it is still complicated to work with (if not used properly), the information obtained is not reliable enough and the number of tests