Check the screwholes of two flanges in the pipeline for alignment with reserved clearance.
检查管路两法兰的螺丝孔的是否有对正及预留的间隙。
2
Cone head drive screw with washer - used on roof for keeping fixing holes watertight.
锥头机螺钉垫圈-用于屋顶保持固定孔水密。
3
Conclusion. Intraosseous ultrasound is a highly reliable technique for the intraoperative assessment of pedicle screwholes before pedicle screw placement.