Echocardiography didn't show normal main pulmonary artery bifurcation structure, and the missing pulmonary artery was from aorta.
超声心动图表现为主肺动脉分叉结构消失，缺如一侧的肺动脉由主动脉发出。
Finally, the static bifurcation of equilibrium positions and local stability of the structure were discussed.
最后，讨论了该结构平衡点的静态分叉和局部稳定性。
New formulations are on the basis of the theory of the bifurcation and the Jacobi matrix eigenvalue structure analysis incorporating the margin and state index of the voltage stability.
这个模型以电压稳定分析的特征结构分析法和分岔分析法为理论基础，把电压稳定的裕度指标和状态指标相结合加入了无功优化中。
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