The basic characteristic of abstract monopoly service system with simple structure is described, and the axiom system on cost allocation of its common losses is built.

就具有最简单结构的抽象垄断服务系统的基本特性及其公共损耗的费用分摊问题建立了较为完整的公平性与合理性公理体系。

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This paper introduces the structure and principle of electronic belt conveyor scale, the experience of keeping its service precision and its maintenance and check in common using.

介绍电子皮带秤的结构与原理，保持使用精度的经验及日常使用中的保养与检查。

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Indeed, the idea of a national postal service, with a common national charging structure, remains popular.

ECONOMIST: Post Office