When it comes to the technology (tools) layer, there are three core SOA technology components that are most frequently used, according to the paper.

就技术(工具)而言，白皮书指出，最常用的核心soa技术组件有三个。

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This paper describes the major design problems of three layer lap-joint and multi-stage dosing asphalt sprayer and introduces the selection of the domestic truck chassis.

本文对三层搭接多级定量沥青洒布车的设计主要问题加以论述，并介绍如何正确选用国产汽车底盘。

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According to the industry field bus technology, this paper has built three layer model for the bus of fire alarm and control system, and has described each layer.

本文参照工业现场总线，提出了火灾报警及消防联动系统现场总线的三层模型，并分别进行了描述。

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