Grinding coal sample result is better than the forming fine coal during contact Angle measurement.
指出在接触角测量过程中，研磨煤样要比成型粉煤测量效果好。
Taking block coal as experimental coal sample, gas emission characteristics of block coal was tested and studied.
以大块煤为实验煤样，实验研究了大块煤瓦斯放散特性。
The testing research about enhancing permeability rate by hydraulic cutting seam on outsize coal sample is introduced.
介绍了特大煤样采用水力割缝提高瓦斯渗透率的实验研究。
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