然后，再将非退化二阶曲线到自身的双射为对合的充要条件推广到退化二阶曲线两相异点列的情形。
Then, the latter necessary and sufficient condition is generalized to the case for the two different point ranges of degenerate second order curve.
目的：探讨静脉注脉射海洛因者血中一氧化氮、一氧化氮合酶与红细胞免疫功能变化的关系。
Objective: To investigate the variable association of nitric oxide, nitric oxide synthase and the immune function of the red blood cells in blood of the patients who injected heroin by way of vein.
然而，用回传波射矩阵法对结构进行模态分析以及用于层合复合材料框架结构动力响应的研究尚未见报道。
However, the studies on vibration modal analysis of frames by means of the MRRM and transient dynamic response of frames made of laminated composite beams have not been reported yet.
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