Pick out the correct statement?

A. Pine oil is used as a modifying agent (for activating or depressing the adsorption of filming

B. nts) in froth floatation process

C. Angle of repose is always greater than the angle of slide

D. ter coal

E. A hopper is a small bin with a sloping bottom

F. A silo is a short height vessel of very large diameter used for the storage of high volatile

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