【Key words】 strategic merger； patterns of merger； risk of merger； three-dimensional principle；
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The principle and method of electron cryomicroscopy and computer three-dimensional reconstruction of icosahedral virus were described in detail, and some improvements were made in this thesis.
本文详细阐述了冷冻电子显微镜技术和二十面体病毒计算机三维重构技术的原理和方法，并对其做了一些改进。
It is briefly introduced that three-dimensional finite difference numerical equation is built according to Darcy's law and water equilibrium principle.
又简介根据达西定律和水均衡原理，建立了三维有限差分数值方程及其解法。
Objective To bring forward The three dimensional concept and Following plastic surgery principle in cleft palate repair.
目的：提出腭裂修复手术方法中的三维立体概念和应遵循的整形外科学原则。
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