搜题请搜索小程序“爱下问搜题”
问题 单项选择题

某二叉树中度为2的结点有10个，则该二叉树中有( )个叶子结点。

A) 9
B) 10
C) 11
D) 12

答案

参考答案：C

解析： 根据二叉树的性质3：对任何一棵二叉树，度为0的结点(即叶子结点)总是比度为2的结点多一个。

改错题

短文改错

As a middle school student of Senior Three, I do sports one and two hours a day, such as doing morning exercises, playing basketball and long-distance running. I think it is real helpful to me. Take exercise makes me even more healthy so that I won’t be ill very often. What’s more, I also get myself relaxing in different kinds of sports. Only in this way I do a better job in my study in high spirit. By doing physics exercise, I’m becoming stronger and confident than ever. I do not think that this is necessary for everyone to spend a little time on sports every day because people’s health is the most important one in modern life.
查看答案
单项选择题 B1型题

符合左心房肥大心电图特点的是（）

A.P波时间=0.15s

B.P波时间=0.10s

C.Ⅰ导联P波振幅=0.1mV

D.aVL导联P波振幅=0.22mV

E.Ⅱ导联P波振幅=0.3mV
查看答案