过去在坑道大巷内敷设永久点时，我们是用粗约四厘米，长约二厘米的金属黄铜杆标敷设，这样做需要石工帮助打很大的眼位，敷设一组（一组是三个测点）永久导线点花费的时间工效及洋灰很多，故此种敷设法是有改进的必要，经组内同志改进，想出了简 In the past, when laying permanent points in tunnel lanes, we laid it with a metallic brass rod roughly four centimeters in length and about two centimeters in length. To do so, we needed masonry to help a great eye position and set up a group Three measuring points) permanent wire point of time spent a lot of work and foreign cement, so the laying method is to improve the need to improve the group comrades, came up with Jane