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问题 填空题

一个四棱锥的底面是正方形，其顶点在底面的射影为正方形的中心．已知该四棱锥的各顶点都在同一个球面上，且该四棱锥的高为3，体积为6，则这个球的表面积是（   ）．

答案

16

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根据句意和提示写出相应的单词。

1. Liu Xiang and Yao Ming are both my _____ (被崇拜的对象；英雄)

2. May is a t _____ friend, for she can keep a secret for me.

3. Betty is _____ (慷慨的) She is always willing to share things.

4. A social worker always listens to people's problems and helps them _____ (work out) their problems.

5. There are many places of i _____ in Suzhou. I'll visit there this weekend.
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问答题 简答题

自清洗过滤器的工作原理？
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