In hydraulic prop, during the yeild, the oil pressure varies from
A. 200 - 500 kgf/cm2
B. 300 - 600 kgf/cm2
C. 100 - 200 kgf/cm2
D. 800 - 1000 kgf/cm2
Answer: Option A
This Question Belongs to Mining Engineering >> Mine Supports And Strata Control
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