题目内容

【题目】在“DIS验证牛顿第三定律”实验中，把两个 传感器的挂钩钩在一起，向相反方向拉动，得到如图乙所示的图线。

（1）请在上述空格填上传感器名称。

（2）（多选题）根据图线能得出的结论是 。

A．作用力和反作用力性质相同

B．作用力和反作用力同时存在同时消失

C．作用力和反作用力大小相等方向相反

D．作用力和反作用力分别作用在两个物体上

【答案】（1）力 （2）BC

【解析】（1）在“DIS验证牛顿第三定律”实验中，把两个力传感器的挂钩钩在一起，向相反方向拉动，得到如图乙所示的图线．

（2）观察分析两个力传感器的相互作用力随时间变化的曲线，可以看出作用力与反作用力一定大小相等，方向相反，作用力与反作用力大小一定同时变化，故选BC。

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【题目】A

The first ancient Olympic Games for which we still have written records were held in 776 BC. Coroebus won the only event at the Olympics. This made him the very first Olympic champion in history. Then they grew and continued to be played every four years. In 393 AD, the Roman emperor Theodosius Ⅰ, a Christian, announced to end the Games because of their pagan (异教的) influences.

About 1,500 years later, a young Frenchman named Pierre de Coubertin began their revival (恢复). In 1892 Coubertin first brought forward his idea to revive the Olympic Games but failed.

Two years later, Coubertin organized a meeting with 79 delegates (代表) who represented nine countries. At this meeting he got what he wanted. All the delegates at the conference voted for the Olympic Games. They also decided to have Coubertin set up an international committee to organize the Games. This committee became the International Olympic Committee (IOC) and Demetrious Vikelas from Greece was selected to be its first president. Athens was chosen for the revival of the Olympic Games and the planning was begun.

The very first modern Olympic Games opened in the first week of April, 1896. Since the Greek government had been unable to afford a stadium, a rich Greek architect, Georgios Averoff, donated one million drachmas (over $100,000) to repair the Panathenaic Stadium, originally built in 330 BC.

Since the Games were not well publicized internationally, contestants (选手) were not nationally chosen but rather came individually and at their own expense. Some contestants were tourists who happened to be in the area during the Games.

【1】What would be the best title for the passage?

A. The History of the Olympics

B. How Coubertin Set up IOC

C. The First Modern Olympic Games

D. Great Changes in the Olympic Games

【2】 Coubertin held a most important meeting with 79 delegates in______________.

A. 1500 B. 1892

C. 1894 D. 1896

【3】 Who offered money to help the first modern Olympic Games?

A. Demetrious Vikelas.

B. Coroebus.

C. Pierre de Coubertin.

D. Georgios Averoff.

【4】At the first modern Olympic Games, ______________.

A. winners were given money as prize

B. IOC invited contestants to tour Greece

C. there were no strict rules for being a contestant

D. many countries chose some athletes to compete

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A．反应过程中的质量亏损是Δm＝0．007 8u

B．反应过程中的质量亏损是Δm＝1．29×10－29kg

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请回答下列问题：

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(2)反应后，装置B中发生的现象是_________________________________；反应的离子方程式为______________________________；装置C中的现象是___________________________，表现了SO2的________；装置D中现象是_____________________________________________，发生反应的化学方程式为_________________________________________。

(3)装置E的目的是探究SO2与品红作用的可逆性，请写出实验操作及现象_________________________。

(4)F装置的作用是________________________，漏斗的作用是___________________________。

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