采用联合接地体时,接地电阻不应大于();单独设置接地体时,接地电阻不应大于();建造

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问题:

采用联合接地体时,接地电阻不应大于();单独设置接地体时,接地电阻不应大于();建造在野外的安全防范系统,其接地电阻不得大于();在高山岩石的土壤电阻率大于2000Ω•m时,其接地电阻不得大于20Ω。

考点:安全防范设计评估师安全防范设计评估师(综合练习)安全防范设计评估师(综合练习)题库
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物质氧化性、还原性的强弱,不仅与物质的结构有关,还与物质的浓度和反应温度有关,下列各组物质:①Cu与浓硝酸;②Fe与浓硫酸;③Na与氧气;④PO与水,由于反应温度不同而能发生不同氧化还原反应的是:(   )

A.②③④

B.①②③

C.②③

D.③④

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One Sunday morning, when I was driving along a road, I saw something I couldn’t believe. A little girl, who was less than two years old, was pushing her stroller (婴儿车) across the road. The traffic was not heavy that morning.

I stopped my car at once and ran toward her. This little girl knew enough to run from a stranger. I tried to catch her in order that I could get her out of the road.

Suddenly her father came running down a hill across the road from where I had parked my car. He ran right to her and caught her up, saying “bad girl” to her. I picked up the stroller and gave it to him. The father grabbed the stroller and walked toward where he came from without a word.

I went back and sat in my car for a few minutes with my son. My hands were shaking and tears were about to run out of my eyes. “Do you feel cold, Mom?” asked my son. I just shook my head.

After this happened, I thought about how thankful I am. Even though the father didn’t say “Thank you”, I feel that I did something good. Doing something for someone else is pleasing, even when it’s only a matter of being in the right place at the right time.

I didn’t really “save” her, but I feel like it was important that I happened to be there. It is sad that I was the only one who stopped. It really made me a little disappointed that no one else stopped to help.

小题1: The little girl ran away from the author because _____.

A.she wanted to look for her father

B.she wanted to stay on the road

C.she needed to catch her stroller

D.she didn’t know the author at all小题2:When the author saw the little girl, _____.

A.there weren’t many cars on the road

B.the girl feared to go across the road

C.the girl had lost her way

D.she was driving to work in a hurry小题3: What can we learn from the passage?

A.The author shared her experience with her son.

B.The author felt sad that no one else helped the girl.

C.The girl’s father didn’t like the girl at all.

D.The girl’s father had wanted to thank the author.小题4:Why were the author’s hands shaking?

A.Because the weather was very cold at that time.

B.Because she failed to be understood by the girl’s father.

C.Because she was not feeling well.

D.Because she was too excited to keep calm.

题型:填空题

目前人类发射的探测器已飞出了太阳系,正往更远的太空飞去,如果探测器所受外力全部消失,那么探测器将(  )

A.沿原路径返回地球

B.沿原方向做减速直线运动

C.立刻静止

D.沿原方向做匀速直线运动

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梅瑞尔的成分显示理论认为可以将知识分为行为水平和内容类型两个维度,其中行为维度包括()

A.记忆

B.运用

C.发现

D.知识

题型:填空题

安全带长度一般为1.5~2m,使用3m以上长绳时,应加( )。

A.保护器

B.隔离器

C.缓冲器

D.传动器

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