讨论了非连通图C12(r1,0,r2,0,…,r6,0)∪Fk,4的优美性,证明了a,k,ri(i=1,2,…,6),为任意自然数,且当r5=r6=0, k=3,r6=a,r5≥2-a,k=4;r6≥4,k=5时,非连通图C12(r1,0,r2,0,…,r6,0)∪Fk,4是交错图。其中C12(r1,0,r2,0,…,r6,0)∪Fk,4表示圈C12的(r1,0,r2,0,…,r6,0)-冠,把顺序有一个公共点的k个C4的连通并图记作Fk,4。
The gracefulness of the unconnected graph C12(r1,0,r2,0,…,r6,0)∪Fk,4 is discussed. Furthermore, we prove the following results:For any natural number a,k,ri(i=1,2,…,6),if r5=r6=0,k=3,r6=a,r5≥2-a,k=4;r6≥4,k=5, then the unconnected graphs C12(r1,0,r2,0,…,r6,0)∪Fk,4 are balanced bipartite graph.