由权值为1,2,3,4,5,6的六个叶子结点构成一棵哈夫曼树，则带权的路径的长度为______。
参考答案：55
玫瑰花样结构见于
A．组合性牙瘤 B．混合性牙瘤 C．牙源性钙化上皮瘤 D．牙源性腺样瘤 E．牙源性钙化囊肿
As is known, it was Hu Jintao, _______ president of our nation, who gave ________ lecture at the ceremony of National Day
A．the; a
B．the ; /
C．a; the
D．/; a
