1) pilot-hole interconnetion
导向孔对接
2) guiding hole
导向孔
1.
2mm, appended the guiding hole with 0.
55mm导向孔,并分别添加在槽孔中心,距槽孔边1mil及与槽孔边相切,得出添加0。
4) directional casting off hole
导向护孔
1.
4 Geological Party of Fujian Province for many years,in the paper the authors made a discussion of the marine sedimentary strata and some special technology and methods of the marine drilling such as a directional casting off hole,drilling with casting,drillhole depth surveying,safety accessories.
通过总结福建省第四地质大队近年来在三都澳海上钻探施工技术，阐述了海相沉积的各种较复杂地层的钻进工艺，以及海上钻探的导向护孔、跟管钻进、孔深丈量、安全设施等特种技术方法。
5) pilot hole
导向钻孔
补充资料：第二孔(继发孔)型缺损
第二孔(继发孔)型缺损
ostium secondary defect
是心房间隔在形成上发生障碍，一般缺损较大，多在卵圆孔附近称第二孔(继发孔)型缺损。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条