孔正植 Gong Jeong-sik
第四脑室正中孔 fourth ventricle ; [解剖] median aperture of fourth ventricle ; [解剖] apertura mediana ventriculi quarti
孔雀王正传 Peacock King
正垂孔 direct plumb line hole
孔径校正 [通信] Aperture correction
正中孔 median aperture ; Foramen of Magendie
常规正压射孔 conventional overbalanced perforating
螺旋桨锥孔修正 scraping of propeller boss
正规穿孔 normal-stage punch
正压射孔 positive-pressure perforating ; overbalanced perforation
非开挖反向回拉扩孔施工过程中时常出现钻杆正转而发生退扣，造成钻具孔内脱落事故的反常现象。
The dropping buckle usually occurs when reverse pulling is used for expanding the bore in the trenchless construction, thus causing the fall-off of the drilling tools.
分析了正循环回转钻深孔施工的施工方法和要点，提出了施工监理的监理质量控制点及注意事项。
The measures to control construction quality are analyzed, which are used to drill deep holes with normal circulation slewing drilling machine.
方法利用正相、反相硅胶柱和大孔树脂柱色谱分离，并通过波谱技术进行结构鉴定。
Methods The compounds were isolated by silica gel, ODS, and macroporous resin column chromatography and their structures were determined by means of spectral analysis.
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