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This question belongs to Mining Engineering Mine Supports And Strata Control

Mine Supports and Strata Control

?

The shale roof some times gives a ringing sound, if thick ness of shale greater than . . . . . . . .

A) 0.1m B) 0.2m C) 0.5m D) 0.3m

Answer & Solution

Correct Answer: Option D

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Question posted by Examveda

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