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Many people know the names Alexander Graham Bell and Thomas Edison. However, most people don’t know the name of the man who invented the television, Philo Farnsworth. Philo Farnsworth was born in 1906 and grew up on a potato farm. As a boy, he loved to learn about science, and he read a lot of science books. When he was only thirteen years old, he drew a picture of a machine that could send pictures as radio sends sounds. He got the idea from the way the potatoes were planted in the field. The potatoes grew in long lines, side by side. This made a shape in Philo’s mind. This shape helped Philo think of a way to send the TV picture onto a piece of glass. But he was poor, so Philo could not try to make his idea into a machine at that time. Later, Philo worked at many different jobs. He worked with trees. He worked on broken radios. He worked on trains. He also worked as a street cleaner. At last, two rich men heard about his idea for television, and they gave him the money to make it. On September 7th, 1927, they watched Philo test the machine he built. When Philo turned on the machine, a small line could be seen on the glass. Philo said, “There you have it, electric television.” Later, a big company, RCA, said they had made the first television. Philo had to spend a lot of money on lawyers to fight them. Finally, he won. Then, World War Two started in 1939. During the war, Philo spent a lot of money helping the US army instead of building up his television company. After the war, other bigger, richer companies started making televisions. In the end, Philo had to sell his company. 小题1:Why does the author mention Bell and Edison at the beginning of the text? A.To remember both of them. B.To prove their wisdom. C.To introduce the topic of the text. D.To explain their relationships. 小题2:According to the text, how old was Philo when he finished his invention of TV? A.27 years old. B.21 years old. C.33 years old D.39 years old 小题3:Philo Farnsworth got the idea for TV from ______. A.the radio B.science books C.potato fields D.a machine 小题4: The underlined part “building up” in the last paragraph probably means “______”. A.starting B.selling C.putting up D.making bigger 小题5:Which is the correct order of the following events? a. Two rich men gave Philo money to do experiments. b. Philo sold his own company. c. Philo beat RCA in law. d. Philo fixed broken radios. e. Philo showed his invention to others. A.d, a, e, c, b B.e, d, c, b, a C.d, c, e, b, a D.a, c, b, d, e
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举一反三
【判断题】过剩空气系数越大,越能保证燃料的充分燃烧。加热炉的热效率也越高( )A. 对 B. 错
A.
正确
B.
错误
【简答题】何为临界粒径?小于临界粒径的颗粒能否被去除?去除的效率与什么因素有关?
【单选题】二次元平面的造型里,不被称为是三个基本形态的是()
A.
平行四边形
B.
正方形
C.
三角形
【单选题】下列关于变压器的说法正确的是?
A.
变压器利用了电磁感应原理
B.
变压器加载的是直流电源
C.
变压器不仅能改变电压还能改变频率
D.
信号领域中变压器的主要作用是改变电流
【简答题】何为临界粒径?小于临界粒径的颗粒能否被去除?去除的效率与什么因素有关?
【简答题】《水调歌头》中最重要的意象是
【多选题】二次元平面的造型里,被称为是三个基本形态的是
A.
平行四边形
B.
正方形
C.
三角形
D.
圆形
【多选题】下列关于变压器的说法正确的是:
A.
变压器可以转变直流电的电压
B.
电力变压器利用电磁感应原理将一种电压等级的交流电转变为另一种频率的另一种电压等级的交流电
C.
变压器一、二次电流的有效值之比与一、二次绕组的匝数比成反比
D.
变压器一、二次侧感应电势之比等于一、二次侧绕组匝数之比。
【多选题】下列关于变压器的说法正确的是:
A.
变压器有升压变压器和降压变压器两种
B.
原、副边的电压比与原副边的匝数比相等
C.
原、副边的电流比与原副边的匝数比相等
D.
原、副边的阻抗比与原副边的匝数的平方比相等
【多选题】二次元平面的造型里,被称为是三个基本形态的是( )
A.
平行四边形
B.
正方形
C.
三角形
D.
梯形
E.
圆形
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