这些物资中的一部分是很难获得的，必须订货。
Some of these supplies are difficult to acquire and must be ordered.
国家实行国家军事订货制度，保障武器装备和其他军用物资的采购供应。
The state practices a state military supplies order system to guarantee the acquisition of weapons and other war materials.
本文研究了水泥这类具有有限使用期的物资在施工中的需求变化规律，并提出了相应的最优订货策略。
In this paper, a class of discrete deterministic zero lead time economic order quantity(EOQ) inventory models with limited period is studied.
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