Web service composition can be divided into two classes, narndy centralized architecture and decentralized architecture, by the location of the Web services composition engine.
组合服务按照其引擎分布可分为：集中式服务组合和分布式服务组合。
A composition often manages the state of its services, similar to what a BPEL engine would do for its composed services.
组合常常对其服务的状态进行管理，与BPEL引擎处理其所组合的服务的方式相似。
The paper presents the composition, functions, technical performance and research of the solid rocket ramjet engine ground test equipment and measurement control system in detail.
介绍了固体火箭冲压发动机地面实验装置及测控系统组成、功能、技术指标和可以开展的研究工作。
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