本文介绍了闭路电视在高速公路监控上的应用，重点介绍了隧道部分闭路监控系统的结构、设备选型、传输方式等。
The paper introduces the application of CCTV in freeway, especially introduces the structure, selection of equipment, transmission mode of the CCTV system in tunnels.
指出洗净水闭路循环是污酸处理的科学和合理的方式，对如何实现洗净水闭路循环处理进行了论述。
Using dilute water closed recirculation was a scientific and rational way. The problem of how to carry out the dilute water closed recirculation was discussed.
其次，在一些公认开始为中立齿轮，例如方式关闭路，而且保证开始之前的中立国。
Second, before the start of some recognition for the neutral gear, such as the way to turn off the road, but also to ensure that the neutral state to start.
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