首先介绍了与Web3d技术紧密相关的虚拟现实技术，包括其基本概念和分类。
First introduced with the Web 3d technology is closely related to virtual reality technology, including its basic concepts and classification.
介绍了SDXC的基本概念与功能、SDXC设备的分类、SDXC设备结构以及在某电信专用传输网中的应用。
It introduces basic concept and function of SDXC equipment, SDXC equipment architecture and its application to a particular telecom transmission network.
介绍了SDXC的基本概念与功能、SDXC设备的分类、SDXC设备结构以及在某电信专用传输网中的应用。
It introduces basic concept and function of SDXC equipment, SDXC equipment architecture and its application to a particular telecom transmission network.
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