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More Mining Engineering Questions
Annual returns shell be submitted by the owner or before of . . . . . . . .
A thickness of the lid not less than . . . . . . . . centimeters.
The interval between two sample places called . . . . . . . .
The temperature of the rock is constant at a depth of . . . . . . . . m from surface.
Weight of gas mask . . . . . . . . kg.