Pick out the correct statement?

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

B. nts) in froth floatation process

C. ter coal

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

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

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

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