coal or rock的用法和样例：
- The rules and effect of power sound wave (PSW) on porosity and permeation of coal or rock were analyzed.
- The characteristics of memory effect of electromagnetic radiation (EMR) during the fracture of coal or rock in different loaded ways are studied.
- By means of the theory of meso-scopic damage mechanics and electromagnetic dynamics, the mechanism of damage extend of coal or rock inside structure and producing EMR are studied.
- The removing of noises is very important for analyzing EME rules of coal or rock and the accuracy of forecasting the dynamical catastrophes with EMR monitoring technology.
- As a result great numbers of vertical and horizontal crannies were produced and the permeability of the pressure-relief coal or rock strata increased greatly than before.
- The influence of electrical parameters of coal or rock upon EMR and the propagating pattern of EMR pulse signal in compound rock-coal strata have been studied.