81. Poisson ratio for rock is generally taken as
82. Support at the goof edge is made strongest. Why
83. In flaggy rocks when bedding planes on them less than
84. Cog are required under regulations at
85. Prime coaking coal occur in India in the state of
86. The length of slot and wedge bolt.
87. Protruding ends of roof bolts can be used to suspend.
88. Sound, pressure level is measured in
89. Poissons ratio is defined as
90. L/W faces with caving have called difficulties in roof control are depth less than nearly . . . . . . . .
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