Check the screw holes 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。
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。
Conclusion. Intraosseous ultrasound is a highly reliable technique for the intraoperative assessment of pedicle screw holes before pedicle screw placement.
结论：对于在椎弓根螺钉放置前术中评估椎弓根螺钉进针骨通道而言，骨内超声检查一项很可靠的技术。
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