某二叉树的中序序列和后序序列正好相反,则该二叉树一定是______ 的二叉树。
A.空或只有一个结点
B.高度等于其结点数
C.任一结点无左孩子
D.任一结点无右孩子
参考答案:C
在下列各句的空白处填入一个适当的词,使句子意思完整、语法正确。(5分)
小题1:Kale wants to have long curly __________ like her mother's.
小题2:People usually wear __________ clothes on cold days.
小题3:Please take __________ the trash when you leave.
小题4:The library is not far from here. Let's __________ bikes there.
小题5:Everyone may make a mistake. Don't laugh __________ others.
下列混合物的分离和提纯方法中,主要是从溶解性的角度考虑的是 [ ]
A.蒸发
B.蒸馏
C.过滤
D.萃取