negative cutoff的意思|示意

It was found that the development of the power stations caused serious pollution, water eutrophication, river flow cutoff and other negative effects.

结果表明，电站开发造成库区污染严重、富营养化、河段断流并产生一定的不利影响等。

The present technique is a new thin cutoff wall construction method by modifying the original method as to use flat drill bit instead of cross bit and adopt positive and negative circulating system.

冲切成槽薄壁混凝土防渗墙施工技术是在原冲击成槽建造防渗墙的基础上，对冲击钻头和施工工艺加以改进，用扁钻头代替十字钻头，用正反两种循环系统进行泥浆循环的一种新防渗墙施工方法。