With differential absorption laser radar as background, the key techniques related in designing real-time monitor and control system based on WDM (Wavelength Division Multiplexing) are studied.

以差分吸收激光雷达为背景，对基于WDM的实时监测控制系统的设计中涉及的关键技术进行研究。

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Objective: To discuss the significance of the non-invasive hemodynamic monitor system in the differential diagnosis of acute dyspnoea .

目的：探讨无创血流动力监测在急性呼吸困难鉴别诊断中的意义。

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In the video circuit of traffic monitor, the image outline dims and the visibility declines because of the limitation of the passband, thus twice differential video compensation is needed.

交通管理监视器的视频电路，受通频带限制导致图像轮廓模糊、清晰度下降，通常需要采用双微分视频补偿。

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