边吃奶边摸下面很爽视频

Projects

Applied to the EDFA

The birth of erbium-doped fiber amplifier is a revolutionary breakthrough in the field of optical fiber communication, it makes the long distance, large capacity, high rate of optical fiber communication, is the DWDM system and in the future high speed system, all-optical network indispensable important component. Its development and application are of great significance to the development of optical fiber communication. Fiber coupler is an important part of EDFA.

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边吃奶边摸下面很爽视频