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问题 单项选择题

100kVA配电变压器低压侧中性点的工作接地电阻，一般不应大于（）。

A.4Ω；

B.10Ω；

C.20Ω；

D.30Ω。

答案

参考答案：B

问答题

根据实际情况回答问题，请把答案写在下面的横线上。

1. What's the most traditional (传统的) festival in China? 　　

                                                                                                                              

2. What do you know about SARS? 　　

                                                                                                                              

3. Please write down at least two of the English-speaking countries. 　　

                                                                                                                              

4. What is Yantai famous for? 　　

                                                                                                                              

5. What do you think we should do to protect our enviorment (保护我们的环境)? 

                                                                                                                              
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单项选择题

传感器节点采集数据中补课缺少的部分是什么？（）

A.湿度

B.温度

C.风向

D.位置信息
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