18.The technical measures and structure,applied principles of blastproof of ventilation shaft at excavating face,specific operational method and prospective effect are described.
介绍了掘进工作面防炮崩风筒主要技术措施及技术结构、应用原理、采用这项技术具体作方法及达到预期果。
19.Heterogenous expression of active nitrile hydratase (NHase) was focused for its great potential in genetically evolution of the operational stability of NHase.
为从基因水平上改造腈水合酶,进行了诺卡氏菌腈水合酶基因外源表达研究。
20.Objective To study operational skill of secondary intraocular lens implantation on aphakic eyes after lensectomy combined with vitreotomy.