Low temperature oxidation of coal is accelerated by the
(A) Storage in large heaps
(B) Storage in compressed piles
(C) Absence of porous or friable particles
(D) All (A), (B) and (C)
(A) Storage in large heaps
(B) Storage in compressed piles
(C) Absence of porous or friable particles
(D) All (A), (B) and (C)