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夏天暴雨前往往会电闪雷鸣，如果在看到闪电后3s才听到雷声，已知当时气温为25℃，声音在空气中的传播速度为346 m/s，那么闪电处距人约___________m．（不计光的传播时间）

答案

1038

阅读理解

阅读理解。

     My good friend Lucy has a big (大的) family. Many (许多的) members are in her family: her

grandparents, her parents, her uncle, her aunt, her two cousins and she. Alan and Gina are her

grandparents. Nick and Sonia are her parents. Paul is her uncle and Mona is her aunt. Dave is Paul and

Mona's first son. He is 12. Tim is Dave's brother. He is 10.

根据短文内容，选择正确选项。

1. _____ members are in Lucy's family.

A. Six  

B. Seven  

C. Eight  

D. Nine

2. Alan is Lucy's _____.

A. grandfather  

B. father  

C. uncle  

D. brother

3. Lucy's parents are _____.

A. Alan and Gina  

B. Nick and Sonia  

C. Paul and Mona  

D. Dave and Mona

4. Tim is Lucy's _____.

A. brother    

B. cousin  

C. friend  

D. son

5. Dave is _____ years older than Tim (比蒂姆大……岁).

A. 12    

B. 10    

C. 4    

D. 2
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问答题 简答题

逆流再生离子交换器中排装置损坏的原因有哪些？
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