71. The preferred shape of an opening in biaxial stress field.
72. For roof stitching the depth of the hole are
73. The roof bolts used in mines are
74. The anchorage in the suppport of roof stitching is
75. In beded rocks, when the beds are in between
76. When roof is tapped with a stick, the dull sound indicates the roof
77. Compressive strength of coal in t/m2.
78. The width of workings from the goaf line to the face called
79. The angle between the vertical and find line of break called
80. ISO certification to mine was required after
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