(7分)某兴趣小组做“探究凸透镜成像的规律”的实验。 (1)如图所示,将蜡烛、

题型:实验题

问题:

(7分)某兴趣小组做“探究凸透镜成像的规律”的实验。

(1)如图所示,将蜡烛、凸透镜和光屏依次放在水平桌面上,点燃蜡烛后,调节烛焰、凸透镜和光屏,使它们的中心位于         ,其目的是使像成在           

(2)小明将蜡烛由距透镜90cm处移至距透镜120cm处的过程中,在光屏上所成的像与透镜间的距离均约为5cm。透镜的焦距约为   cm,判断的依据是          

____________________      

(3)小虎将蜡烛、凸透镜和光屏调到如图所示位置时,在光屏上得到把一个清晰的像,这个像一定是      _____ (填“放大”“缩小”或“等大”)的。

(4)小红同学将蜡烛和透镜固定,无论怎样移动光屏,都不能在光屏上得到清晰的像,原因可能是_______________________________________________           

                                                       _(写出一个)

(5)把图中的凸透镜看作眼睛的晶状体,光屏看作视网膜.给“眼睛”戴上远视眼镜,使烛焰在“视网膜”上成一清晰的像.若取下远视眼镜,为使光屏上得到清晰的像,应将光屏___________(选填“远离”或“靠近”)透镜。

考点:透镜及其分类
题型:实验题

会计报表的编制要求有()。

A.数字真实

B.内容完整

C.便于理解

D.编报及时

题型:实验题

全国的少数民族高等院校很多,基本上各个少数民族聚集地都有少数民族的高等院校,如西藏大学、新疆大学、内蒙古大学,另外还有诸如中央民族大学、中南民族大学、西南民族大学和西北民族大学等。这从根本上说明了[ ]

A.党和政府重视少数民族教育的发展

B.党和政府实行民族平等、民族团结和各民族共同发展繁荣的原则

C.少数民族地区教育事业发达

D.我国民族区域自治制度的优越性

题型:实验题

阅读理解。

     For years I wanted a flower garden, but with five children I was too busy to have one. Money was limited,

and so was time. Often one of the children would want something that cost too much, and I would say, "Do

you see a money tree outside? Money doesn't grow on trees, you know. "Finally, when all five had gotten

through high school and college, and had started having their own families, I started thinking again about having a garden. However, I knew gardens cost money.

     Then, one spring morning on Mother's Day, as I was working in my kitchen, I heard cars drive by and

looked out of the window to see a new tree planted in my yard. I couldn't believe my eyes: it was a money

tree! Dollar bills were stuck all over that tree, and there was a note which read: "I owe you eight hours of

digging time. Love, Marvin."

     Marvin, my first son, kept his promise. He dug up a nice ten-by-fifteen-foot bed (花坛,花圃) for me. My

other children bought me tools, a sunflower stepping stone (踏脚石) and gardening books. We built a garden

together.

     That was three years ago. My garden is now very pretty, and just what I'd always wanted. When I go out

to weed or tend my flowers, I don't seem to miss my children as much as I once did. It feels as if they were

right there with me. When I think about what my children have done for me, I get tears in my eyes every time. I'm still not sure whether money grows on trees. But I know love does!

1. Why had the author never had a flower garden before?

A. Because she had five children to take care of.

B. Because she didn't have enough time and money.

C. Because her children wanted expensive things.

D. Because her children were going to high school and college.

2. Who helped the author build the garden at last?

A. Her neighbor.

B. Her first son.

C. Her husband.

D. Her five children.

3. Why doesn't she miss her children as much as she once did?

A. Because she has a big money tree.

B. Because she has a very pretty garden.

C. Because she feels the love of her children in the garden.

D. Because she is busy weeding or tending her flowers.

4. Which of the flowing statements is correct, based on the passage?

A. Money grows on trees only if you plant them with love.

B. The author built a pretty garden after her children had graduated from school.

C. The author actually wanted to have money grow on trees.

D.The children loved their mother so much that they helped her realize her dream.

5. The purpose of this passage is to tell us_________.

A. how to grow you own money tree

B. the story of pretty garden

C. the story of a money tree

D. a story of the love between a mother and her children

题型:实验题

建筑安装工程中的材料费不包括( )。

A.检验试验费

B.运输损耗费

C.采购保管费

D.二次搬运费

题型:实验题

怎样来到大安心、大自在的境界?

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