heading face短语¹⁸⁰⁰⁹⁸⁺¹ 基本例句 🥺巷道工祖,工作面前壁 The practice demonstrates that the prediction to adverse geologic condition in front of the heading face by boring radar and BEAM electric method, especially to water- holding condition, is satisfied. 实践表明，采用钻孔雷达和 BEAM电法探测技术对隧道掌子面前方的不良地质情况，尤其是含水情况具有较好的预测结果。 cnki