Controlling maintenance cost is an important task during the aircraft development stage, and estimating the direct maintenance cost (DMC) of the component is a pivotal step in the control processes.

控制维修成本是飞机研制中的一项重要任务，而部件直接维修成本(DMC)的预计是控制过程中的关键步骤。

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The method needs fewer control component and has lower fault rate, can save energy and cut galvanizing cost down.

所需控制元件少，故障率低。可大大节约能源，降低镀锌成本。

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The paper brief the situation and component of our country salt industry cost, combining the real produce condition, it gives the control means, points for attention of cost control of salt produce.

本文简要叙述了我国制盐成本的现状及组成，并结合实际介绍了制盐成本控制的方法和注意事项。

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