When referring to quantity of barite in a P-tank，ullage is the ______．A.Distance of the barite surface above the tank bottomB.Percentage of barite in the tankC.Distance of the barite surface below the tank coverD.Total weight of barite in UPC（ullages per centimeter）
When referring to quantity of barite in a P-tank，ullage is the ______．
A.Distance of the barite surface above the tank bottom
B.Percentage of barite in the tank
C.Distance of the barite surface below the tank cover
D.Total weight of barite in UPC（ullages per centimeter）
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