PDF(126 KB)
Discussing of Maintance Principium and Timbering Methods in Unstable Drifts
CHEN Hong-Bing, LIU Hua-Jie
Gold Science and Technology ›› 2007, Vol. 15 ›› Issue (1) : 45-47.
PDF(126 KB)
PDF(126 KB)
Discussing of Maintance Principium and Timbering Methods in Unstable Drifts
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