Introduces the issues on application of CCTV system based on the MPEG-4 compression, SDH optical transmission and large capacity hard disc storage technologies in urban rail transportation.
介绍了基于MPEG - 4压缩技术、SDH光纤传输技术和大容量硬盘存储技术的电视监控系统在城市轨道交通中的应用问题。
The emery paper is applicable in the grinding and polishing of most work pieces including metal, metal alloy, ceramic, optical element, fiber connecter, hard disc and semiconductor, etc.
该研磨纸可 用于众多工件的研磨和抛光，包括金属、金属合金、陶瓷、光学元件、光纤连接器、硬盘、半导体等领域。
The emery paper is applicable in the grinding and polishing of most work pieces including metal, metal alloy, ceramic, optical element, fiber connecter, hard disc and semiconductor, etc.
该研磨纸可 用于众多工件的研磨和抛光，包括金属、金属合金、陶瓷、光学元件、光纤连接器、硬盘、半导体等领域。
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