题目内容

一棵二叉树有10个度为l的结点，7个度为2的结点，则该二叉树共有_______个结点。

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A strength, toughness, plasticity, conductivity and so on
B shaping and treating operations
C depriving, purification, admixture and manufacture
D the ability to bend rather than break under a sudden blow
E chemical metallurgy and physical metallurgy
F melting and refining furnace
The art of metallurgy consists of ______.

For this part, you are allowed 30 minutes to write a composition on the topic 2008 Olympics and I. You should write at least 150 words, and base your composition on the outline given in Chinese below:
1．北京2008年奥运会的重大意义
2．你能为北京奥运会做些什么
3．展望北京奥运会的前景
2008 Olympics and I

你作为领导秘书。如何协助领导举办一个年度总结会？

What did the two astronauts think the trip would be like？
______.