等腰三角形的底角是顶角的两倍，则此等腰三角形的顶角为______．

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问题填空题

答案

设等腰三角形的顶角度数为x，

∵等腰三角形的底角是顶角的两倍，

则底角度数为2x，

根据三角形内角和定理：x+2x+2x=180°，

解得x=36°，

故答案为36°．

填空题

单词填空。（首字母已经给出，每空一词）

1. If you play against No.1 School, we will go and c________ you on?

2. You may get a headache when you exercise o________ an empty stomach.

3. Kangkang's father is a doctor. He is very busy right now. He is e________ the patients.

4. —Would you m________ lending your dictionary tome? —Not at all. Here you are.

5. When SARS spread in Beijing, many doctors and nurses left their families and took an active part

in the b________ Against it.

单项选择题

主合同法律关系消灭，担保法律关系就会()。

A.消灭

B.转移

C.延效

D.缩短