Is PTH and small via hole wall quality checked by cross-section and followed by a closed loop corrective action?
是否通过切片检验pth与小导通孔孔壁状况，并有相应的改善对策跟踪？
2
A method of surveying crosssection map is introduced unwanted center line piles. the method is simple and convenient, and can raise operational efficiency and work quality.
本文介绍一种不放线路中桩测绘横断面图的方法。该方法简单方便灵活，能提高作业效率和工作质量。
3
Its main work includes the Yellow river sediment cross-section tests, river bed surface quality sampling and particle size distribution analysis and so on.