贷记卡业务风险有哪些（）
A.操作风险
B.消费风险
C.交易风险
D.欺诈风险
E.信用风险
参考答案：A, C, D, E
The party, which had been greatly _____, was spoiled by the rude behavior of an uninvited guest.
A．looked forward to
B．looked up to
C．called forth
D．called for
对于给出的一组权w=5，6，8，12，通过霍夫曼算法求出的扩充二叉树的带权外部路径长度为______。
