试题与答案

下列命题中正确的是______. ①若△ABC在平面α外,它的三条边所在的直线分

题型:填空题

题目:

下列命题中正确的是______.

①若△ABC在平面α外,它的三条边所在的直线分别交α于P、Q、R,则P、Q、R三点共线;

②若三条直线a、b、c互相平行且分别交直线l于A、B、C三点,则这四条直线共面;

③空间中不共面的五个点一定能确定10个平面.

答案:

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题型:单项选择题

已知一个二又树的先序遍历序列为①、②、③、④、⑤,中序遍历序列为②、①、④、③、⑤,则该二叉树的后序遍历序列为 (97) 。对于任意一棵二叉树,叙述错误的是 (98)

(98)处填()。

A.由其后序遍历序列和中序遍历序列可以构造该二叉树的先序遍历序列

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C.由其层序遍历序列和中序遍历序列可以构造该二叉树的先序遍历序列

D.由其层序遍历序列和中序遍历序列不能构造该二叉树的后序遍历序列

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