对于给出的一组权W={10,12,16,21,30},通过哈夫曼算法求出的扩充二叉树的带权外部路径长度为______。
A.89
B.189
C.200
D.300
参考答案:C
It is accepted that children need friends of their own age .
A.to play
B.to play with
C.to be played
D.to be played with
在创卫标准中公共场所的范围有哪些?