【摘要】 本文给出了一个判断图类Ｂ（ｎ，３，ｍ）是否优美图的必要条件，并证明了当ｎ＝８Ｋ—１或ｎ＝８Ｋ＋１（Ｋ≥１为整数）时，图Ｂ（ｎ，３，３）不是优美图．更多还原

【Abstract】 This paper is concerned with the problem of Bermond in Graceful graph Theory.A necessary condition for B(n, 3,m)to be graceful is given,and it is also proved that if n=8k-1 or n=8k+1 the graph B(n, 3,3)is never graceful.更多还原