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Objective: To study the finger ridge count and t triangle of 300 normal people of Bai Nationality, and to provide normal parameters for medicine, genetics and anthropology.

目的:研究300名正常白族人指嵴纹数和t三叉,为医学、遗传学、人类学提供正常参数。

If G is 3 or 4 connected graph without T-triangle,then <EC(G)> is 2 connected.

　引进T-三角形的概念,证明了,对于k(k=3或4)连通图G,若G无T-三角形,则是2连通的,从而改进了N。