第五章研究了二维脉冲竞争模型的持久性和灭绝性。
In chapter 5, we discuss the permanence and extinction for two class of two dimensional impulsive competitive model.
目的：评价X线和二维脉冲多普勒超声对法乐氏五联症的诊断价值。
Objective: To evaluate the diagnostic value of X-ray and two-dimensional pulse Doppler ultrasound for the Fallot's pentalogy.
本文研究二维非均匀有耗介质柱在电极化二维脉冲波激励下的瞬态散射。
The transient scattering of an electrically polarized, 2-d pulsed wave by 2-d inhomogeneous, lossy dielectric cylinder is investigated.
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