When the pre-set time is up, the connecting passage is clear and the air-operated soundingelement is forced to make sound by the airflow.
当达到预置时间时，连接通道畅通使气流作用于气动发声元件发声。
2
The topographic correction of the electric sounding data by the boundary element method for anomalous potential is discussed, and the significance effect is obtained.
求解异常电位的边界单元法对电测深资料进行地形改正，应用效果明显。
3
In this paper, we performed modelling of DC resistivity sounding in tunnel using the finite element method (FEM).