题目内容

外部的身体姿态可以准确的呈现出人们的内在情绪

A. 对
B. 错

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Fill in the blanks in the following paragraph with key information from the text to sum up the main idea of the text.The maker movement is now ( 1 ) in China and makerspaces like （ 2 ） and （ 3 ）are open to the public. A maker is someone who builds, creates or hacks （4 ）. They are different from the traditional inventors who tinkered in garages. Makers often use （5 ） to design objects to be produced by （6 ） like 3-D printers. And they often cooperate and （7 ）their ideas online. The Chinese government is supporting this movement by buildingmore government-supported （8 ） and organizing （9 ）. And it is hoped that this movement can help Chinese industrymove to a new stage. Although some observers see China’s maker movement as producing （10） goods, Mr. Pan Hao, founder of Seeed Studio, advises patience.

以下关于多路复用基本概念的描述中,错误的是()。

A. 时分多路复用通过为多个信道分配互不重叠的时间片来达到多路复用的目的。
B. 频分多路复用通过设置多个频率互不重叠的信道来达到同时传输多路信号的目的。
C. 波分多路复用通过光振幅达到多路复用的目的。
D. 码分多址是在同一个频段的不同信道采用特殊挑选的码型达到互不产生干扰的目的。

光纤按照其轴芯的模式,可分为单工光纤和双工光纤。

A. 对
B. 错

假定有一个带宽为3KHz的理想低通信道,若每个码元能携带3bit的信息量,计算最高信息传输速率。