Refining plant of a refinery located in walking 2 refined each time. Distillation of the crude grade A and 1 unit Grade B has 3 units and grade C for 1 unit for refining the crude grade A and 1 unit Grade B is 4 units and grade C is 5 units Factory refined delivery. customer is grade A 100 Grade B 340 units C 150 units, factory units and grades will have to be refined a few times. It is oil each grade by customer demand. And cost to a minimum. If the cost of each machine for each run of 4,000 baht.
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