单项选择题
某二叉树的前序序列和后序序列正好相反,则该二叉树一定是()的二叉树(武大)
A、空或只有一个结点
B、任一结点无左子树
C、高度等于其结点数
D、任一结点无右子树
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问答题
XeF2分子稳定构型为（ ）型 -
单项选择题
Economists agree that A、neither high inflation nor moderate inflation is very costly. B、both high and moderate inflation are quite costly. C、high inflation is costly, but they disagree about the costs of moderate inflation. D、moderate inflation is as costly as high inflation. -
判断题
原子所能形成的共价键数目等于原子核外的未成对电子数。
