题目内容

电路交换的优点有______。 Ⅰ．传输时延小 Ⅱ．分组按序到达 Ⅲ．无需建立连接 Ⅳ．线路利用率高

A. Ⅰ、Ⅱ
B. Ⅱ、Ⅲ
C. Ⅰ、Ⅲ
D. Ⅱ、Ⅳ

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某信道的信号传输速率为2000Baud，若想令其数据传输速率达到8kbit/s，则一个信号码元所能取的有效离散值个数应为______。

A. 2
B. 4
C. 8
D. 16

下列说法正确的是______。

A. 将模拟信号转换成数字数据称为调制
B. 将数字数据转换成模拟信号称为解调
C. 模拟数据不可以转换成数字信号
D. 以上说法均不正确

以下关于血管吻合的基本要求中，哪项是错误的

A. 吻合口的血管内膜应紧密接触
B. 没有血管外膜植入吻合口
C. 吻合口不产生狭窄
D. 吻合口的血管应无张力
E. 针距边距大小对吻合效果影响不大

· As you listen, for questions 1-12, complete the notes, using up to three words or a number. About the Address 1. The topic of the address is on the benefits of . 2. Later Mayor Xu and the addressor will sign a . 3. The purpose of the meeting is to develop . The Electronic World has Different Ingredients 4. First, . 5. Second, . 6. Third, . How to Exchange Values 7. People exchange values with virtual banks, and new devices. The Three Steps of Shopping 8. _ . 9. . 10. . Shopping Tips 11. Use to quickly find what you’re looking for. 12. Until an order is __, the shopping becomes an actual one.