fracture network \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$D_{\text{B}}$$\end{document} D B exhibit an increasing trend.
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Experimental study on freeze-thaw damage characteristics of coal samples of different moisture contents in liquid nitrogen.
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