1) hole top
孔顶
1.
Experimental study of hole top strength about high strength reinforcement prestress concrete voided slabs;
高强钢筋预应力砼空心板孔顶强度试验研究
2) top aperture
顶孔
1.
Conclusion is made that modification of the top aperture chamfering of the roving tube and movement of the inserts POM downward can solve the said problems and stablized the spinning quality.
根据生产实际对纱管提出具体要求和检验方法,重点分析了粗纱管发生顶管问题的原因,提出改造粗纱管顶孔倒角、POM嵌件下移,可有效防止上述问题发生,稳定成纱质量。
3) piercing plug
穿孔顶头
1.
The piercing plug is one of the most important tools used for the seamless steel tube production.
穿孔顶头是无缝钢管生产中最重要的模具之一,文章通过分析穿孔机顶头的失效形式,并从顶头外形、材质、表面氧化等方面探索提高顶头使用寿命的方法。
2.
The microstructure and hardness of piercing plug made of 20CrNi3MoW steel were studied.
对20CrNi3MoW钢穿孔顶头的显微组织和硬度变化进行了研究。
3.
This review focuses on various aspects of piercing plug surface oxide film,including formation,compose,property,effect,transformation in the piercing course and the influence of plug's life.
概述了穿孔顶头表面氧化膜的形成、结构、性质、作用,在穿孔过程中的变化及其对顶头使用寿命的影响。
4) Piercing plug bar
穿孔顶杆
6) whole span jack-up
整孔顶升
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