Permitted explosives used in blasting off the solid in underground coal mine of degree-1 Gassy seam is:
A. 𝑃𝑃-1
B. 𝑃𝑃-3
C. 𝑃𝑃-5
D. 𝑃𝑃-4
Answer:C
Permitted explosives used in blasting off the solid in underground coal mine of degree-1 Gassy seam is:
A. 𝑃𝑃-1 B. 𝑃𝑃-3 C. 𝑃𝑃-5 D. 𝑃𝑃-4