THE economy is in recession but sales of at least two items are booming in Venezuela: water-storage tanks and portable generators.
委内瑞拉经济陷入衰退，但是至少还有两样物品的销量仍非常火红︰储水塔、可携式发电机。
2
The dissertation studies cost of logistics on economy of scale, and puts forward expression of storage cost and transport cost.
研究了物流费用的规模经济问题，给出了仓储费用和运输费用的表达方法；
3
The influence of composite relationship between cold storage ratio and energy price on the economy of combined cooling, heat and power system is studied with examples.