...对称要素间具有一般的关系, {hkl}, {hkil}一般形; 如晶面与 对称要素间垂直、平行或等角度相交, 则为特殊形; • 开形(open form)和闭形(closed form): – 由一个单形本身的全部晶面不能围成封闭空间的单形, 称为开形, 否则为闭 形.
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最后利用所得到的规范形和普适开折讨论了非线性动力系统的余维3退化分叉。
Finally we use obtained normal form and universal unfolding to discuss codimension 3 degenerate bifurcations of nonlinear dynamical system.
目的研究“摇椅形”弓丝对前牙开牙合畸形的矫治效果。
Objective To study the effect of the application of reverse-curve arch wire for the treatment of anterior open bite.
整个建筑被混凝土的两翼托举到地面以上。混凝土结构设有拱形、三角形和矩形的开孔，允许参观者将这些区域作为走廊。
The whole building is raised above its site on fins of concrete, featuring arched, triangular and rectangular cutouts that allow visitors to use the area as a covered walkway.
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