【题目】如图所示，我们可以探究平行板电容器的电容与哪些因素有关。平行板电容器已充电，带电量为Q，静电计的指针偏角大小，表示两极板间电势差的大小。如果使极板间的正对面积变小，发现静电计指针的偏角变大，我们就说平行板电容器的电容________（填“变大”或“变小”）；如果使两极板间的距离变大，发现静电计指针的偏角变大，我们就说平行板电容器的电容________（填“变大”或“变小”）。我们之所以能够得出这些结论是因为电容器的电容C=________。
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【题目】设复数z＝2m＋（4－m2）i，当实数m取何值时，复数z对应的点：
（1）位于虚轴上？
（2）位于一、三象限？
（3）位于以原点为圆心，以4为半径的圆上？
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【题目】 短文改错
假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏字符号(/\)，并在其下面写出该加的词；
删除：把多余的词用斜线(\)划掉；
修改：在错词下画一横线，并在该词下面写出修改后的词。
注意：1. 每处错误及其修改均仅限一词；
2. 只允许修改10处，多者(从第11处起)不计分。
Two years before, I traveled to Brazil and I rented for a car. Unfortunate, I had an accident and hit another car, and I needed to stay in a hospital for at least two week. I called my parents, so I did not tell them what had happened. I knew that they will be worried about myself because I was so farther away, and that my mother would not sleep if she knew. Therefore, I told them interested stories and how I was enjoying Brazil. As a result, nobody knew truth. I still think that it was the right thing to do.
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【题目】 短文改错
假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏字符号(∧)，并在其下面写出该加的词。
删除：把多余的词用斜线(＼)划掉。
修改：在错的词下画一横线，并在该词下面写出修改后的词。
注意：
1. 每处错误及其修改均仅限一词；
2. 只允许修改10处，多者(从第11处起)不计分。
Which is known to all, nowadays the Internet is playing more and more important part in our daily life. In it, we can not only read news at home and abroad but also get so much information as possible. We are often send e-mails to our classmates. We can make telephone call to our families as well as our friends. However, we can go to school on the net, read different kinds of books and even teach myself English. We can also enjoy music, watching sports and play computer games on the Net. We could do shopping even without leaving our homes.
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【题目】短文改错
假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏词符号（∧），并在其下面写出该加的词。
删除：把多余的词用斜线（\）划掉。
修改：在错的词下划一横线，并在该词下面写出修改后的词。
注意：
1. 每处错误及其修改均仅限一词；
2. 只允许修改10处，多者（从第11处起）不计分。
The summer holiday is coming. Our class has a discussion about what to do during the holiday.
Some are in favor of staying at home. They think it’s both convenience and comfortable. What’s more, they can to save money for other purposes. But they will lose chance of getting to know the outside world. Besides, others prefer to go out for traveling, that can increase their knowledge and broaden their horizons. But they will spend more money or meet some difficulties while traveling.
In my opinion, it would be much good to stay at home, for I can do how I like, such as reading books, watching TV, and help my parents with the housework.
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【题目】2016年9月11日，山东青岛市即墨于21时25分发布雷电黄色预警信号。当晚受雷阵雨影响，空气潮湿。距地面一定高度的空中有两块相距3 km的足够大的云团，两块云团正在以5 m/s的相对速度靠近，不断与空气摩擦带电。设两云团之间电势差保持3×109 V不变，已知发生放电时的电场强度为3×106 V/m，云团间的电场可视为匀强电场，则大约经过________秒，将会发生放电现象；在这次放电中，若从一块云团移到另一块云团的电荷量为500 C，闪电历时0.01 s，则此过程中的平均电流为________安培。
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【题目】如图所示是电饭煲的电路图，S1是一个控温开关，手动闭合后，当此开关温度达到居里点（103 ℃）时，会自动断开。S2是一个自动控温开关，当温度低于60 ℃时会自动闭合；温度高于80 ℃时，会自动断开。红灯是加热时的指示灯，黄灯是保温时的指示灯。分流电阻R1＝R2＝500 Ω，加热电阻丝R3＝50 Ω，两灯电阻不计。
（1）根据电路分析，叙述电饭煲煮饭的全过程（包括加热和保温的过程）。
（2）简要回答，如果不闭合开关S1，电饭煲能将饭煮熟吗？
（3）计算加热和保温两种状态下，电饭煲的消耗功率之比。
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【题目】B
Katharine Graham, once described as ＂the most powerful woman in America＂, was the owner and publisher of The Washington Post newspaper. Under her leadership, it became one of the most important newspapers in the country.
Katharine Graham was born in New York in 1917. Graduating from the University of Chicago in 1938, Katherine got a job as a reporter for a newspaper in San Francisco, California. In 1933, Katharine’s father bought a failing newspaper, The Washington Post. It was the least successful of five newspapers in Washington.
Soon Katharine returned to Washington and got a job editing letters to the editor of her father’s newspaper. In 1946, her husband Philip Graham became publisher of The Washington Post. When she was 46, her husband died, leaving Katharine Graham four children to raise and a newspaper to operate.
At first, she was concerned only with finding a way to keep control of The Washington Post until her sons were old enough to lead it. She had no training in business or experience in operating a large company and decided to learn. She hired excellent reporters and editors. In 1969, Missus Graham became publisher as well as president of The Washington Post company. In the 1970s, The Washington Post became famous around the world. Katharine Graham also played an important role in supporting women by employing more of them. When she was eighty years old, Katharine Graham wrote a very popular book called Personal History about her life, which won a Pulitzer prize for biography in 1998. Friends of Katharine Graham said she used her intelligence and bravery to improve the American media.
【1】 Katharine Graham first worked as ___________.
A. a reporter B. an editor
C. a publisher D. a manager
【2】 When Katharine’s father bought The Washington Post, __________.
A. it had been in business for a short time
B. it was one of the largest newspapers in the US
C. it was in a difficult situation
D. it had enjoyed great success and fame
【3】The most difficult time for Katharine came when __________.
A. her father died
B. her husband died
C. she took control of The Washington Post
D. she returned home to raise her four kids
【4】What can we infer from the passage?
A. The newspaper was failing under Katharine’s control.
B. There were more women editors than men editors in The Washington Post.
C. Katharine probably had a difficult time operating the newspaper at first.
D. Katharine was best known for her book Personal History.
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【题目】两物块A、B用轻弹簧相连，质量均为2 kg，初始时弹簧处于原长，A、B两物块都以v＝6 m/s的速度在光滑的水平地面上运动，质量4 kg的物块C静止在前方，如图所示．B与C碰撞后二者会粘在一起运动．则在以后的运动中：
（1）当弹簧的弹性势能最大时，物块A的速度为多大？
（2）系统中弹性势能的最大值是多少？
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