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问题 单项选择题

下面关于哈夫曼树的叙述中，正确的是（）。

A．哈夫曼树一定是完全二叉树

B．哈夫曼树一定是平衡二叉树

C．哈夫曼树中权值最小的两个结点互为兄弟结点

D．哈夫曼树中左孩子结点小于父结点，右孩子结点大于父结点

答案

参考答案：C

填空题

根据短文内容及首字母提示,完成下列单词拼写。

     I have a g___1___ friend in my school. Her n____2____ is Li Ying. She gets up early every day. She

likes to b___3___ early. She does morning exercises a___4___ she gets up at six.  Then she washes her

hands a___5___ face. She has breakfast at a____6__ six forty. She leaves home at 7 o'clock. C___7__ begin at ten to eight. And she has four classes in the morning and two in the a__8____. At 3:30 she plays

games with her f___9___. She gets home at 5:30. She often watches CCTV news at 7:00 in the evening. And she goes to bed at ten e___10___ night.

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问答题 简答题

蓄电池的具体作用。
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