问题
选择题
下列关于模拟信号与数字信号的说法正确的是（ ） A．模拟信号比数字信号的抗干扰能力强 B．模拟信号比数字信号的抗干扰能力差 C．模拟信号与数字信号的抗干扰能力一样好 D．电话只能用数字信号传输信息 |
答案
答案：B
搜题请搜索小程序“爱下问搜题”
下列关于模拟信号与数字信号的说法正确的是（ ） A．模拟信号比数字信号的抗干扰能力强 B．模拟信号比数字信号的抗干扰能力差 C．模拟信号与数字信号的抗干扰能力一样好 D．电话只能用数字信号传输信息 |
答案：B
| 阅读下文，掌握其大意，然后从各题所给的四个选项中选出一个最佳答案。 | ||||
| Once upon a time, some children 1 at seaside when they found a turtle (海龟). They began to beat the turtle. Just at that time, a young man came and said to them, "Stop!" The children ran away 2 . The turtle was very thankful and said, "Thanks for your 3 . I really would like 4 you to a wonderful palace now." The young man rode on the back of the turtle and was taken to the secret palace in the sea. When he 5 the palace, he was very surprised and said to the turtle " 6 nice palace!" To thank him, the king of the turtles gave him a very 7 dinner. He had never seen 8 a dinner before. He received a warm welcome there and was very pleased 9 everything. After dinner, the king of the turtles said, "I am going to give you two boxes, 10 you can open only one." "You mustn't open both. Don't forget it!" the turtle warned him. "All right. I will open only one." The young man promised. At this time, a large wave sent him out of the sea. After he went back home, he opened the 11 one of the two boxes. To his surprise the box was full of gold. "My God!" he cried. "I'm a rich man now." Then he thought, "Things in the other small box must be expensive, too." He could not wait 12 . He broke his promise and opened the other box. As soon as he opened it, he became an old man. His hair turned white. His face looked like an old man over eighty years old. It all happened in a moment. He was sorry for what he did, but it was too late. | ||||
|