The stress change of coal body around the gas drainage borehole is one of the important factors affecting its permeability. In order to study the permeability with different degrees of fragmentation around the gas drainage boreholes. some coal particle composite samples with different range of particle diameter were prepared by the method of continuous grading. and the triaxial permea... https://www.alarecre.com/Disney-The-Nightmare-Before-Christmas-Lock-Shock-and-Barrel-Art-AirPods-Pro-2nd-Gen-Skin-p101716/