某二叉树中度为2的结点有18个,则该二叉树中有______个叶子结点。
参考答案:S
解析: 在任意一棵二叉树中,度为0的结点(即叶子结点)总是比度为2的结点多一个。
-What are you looking for?
-I'm looking for the book I bought yesterday. [ ]
A.who
B.which
C.whose
D.what