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。
基本语法。
1. The streets here _____ (clean) by the cleaners every morning.
2. These flowers _____ (water) once every three days.
3. Many new things _____ (invent) by the scientists in the 20th century.
4. Yesterday a composition on protecting animals _____ ( write) by the students of our class.
5. The little girl had learned to play the piano _____ the age of five.
下列不属于民事诉讼法基本原则的是()。
A.辩论原则
B.支持起诉原则
C.公开审理原则
D.法院调解自愿和合法的原则