As an important accounting information quality characteristic, timeliness has always been an important research category in accounting field.

“及时性”是一项重要的会计信息质量特征，一直以来是会计领域研究的重要范畴。

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The first chapter of this article defines the space of display art design research, analyzes its characteristic, idea, elements, and enumerates its research category and classification.

本文第一章定义了展示空间艺术设计的概念，分析了其特征、观念和要素，列举了展示空间艺术设计的研究范畴及分类。

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And then, the category of laser ceramic, laser active ion, laser spectrum characteristic and the method of making laser ceramic are introduced respectively.

接着分别介绍了激光陶瓷的种类、激光离子、光谱与激光特性和激光陶瓷的制备方法。

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