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给出了连通循环图G=Cn〈j1,j2,…,jr〉带宽B(G)的上界,即B(G)≤2jr,并研究得到了四度连通循环图G1=Cm1m2〈k1m1,k2m2〉的带宽B(G1)=2min(m1,m2)(m1=gcd(m1m2,j1),m2=gcd(m1m2,j2)),及五度连通循环图G2=Cm1m2〈j1,j2,m1m2/2〉的带宽B(G2)=4min(m1,m2)(2m1=gcd(m1m2,j1),2m2=gcd(m1m2,j2)).