通过数据采集，进行坐标转换，能够方便地计算出测点超欠挖。
Through data collection and coordinate transformation, the over-under-excavated values can be obtained easily.
本文详细地介绍了电磁阀的结构、工作原理、超欠压保护和远程控制功能的实现。
The paper detailedly introduces electromagnetic valve's composition, operating principle and the fulfillment of over-under pressure protection and remote control.
在超欠挖严重的情况下，对隧道的稳定性，尤其是软岩隧道会产生一定的影响。
Tunnel stability, especially in soft rock tunnel, will be affected to certain degree for the enormous over-break or under-break of excavation.
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