题目内容

对于带宽为2MHz的信道，若用4种不同的状态来表示数据，在不考虑热噪声的情况下，该信道的最大数据传输率是多少？(要求列出简要计算步骤)

查看答案

搜索结果不匹配？点我反馈

更多问题

以下关于小儿先天性肥厚性幽门狭窄的叙述中，正确的是

A. 先天性肥厚性幽门狭窄常合并其他先天性畸形
B. 与消化道激素功能紊乱和幽门肌间神经丛发育异常无关
C. 幽门环肌切开术为小儿先天性肥厚性幽门狭窄标准的手术治疗方式
D. 以贲门环肌增厚、胃输入道梗阻为主要特征
E. 典型病例上腹剑突下可触及"橄榄"样幽门肿块

On line courses (also called distance learning) are a hot new trend in American education. According to the nonprofit Distance Education and Training Council, about 400 US colleges and schools offer some portion of their programs on the We b. At the university level, they cost the same as traditional classes and requir e similar weekly assignments and textbook reading, the difference is in class pa rticipation. Generally speaking, students congregate(使聚集) on line throughout each week to explore topic with the professor, but these discussions occur “asynchronously(不同时发生地)”rather than in real time. (You read others’ comments and post your own whenever you get a chance.) Written assignments are posted, you email in your work periodically, and you’re required to take a proctored exam in order to receive degree credit. Career boosting business administration and information technology programs are the most popular, but you’ll also find a variety of literal arts offerings, from film theory to medieval history and foreign lang uage study. While you still can’t get an Ivy League degree on line, a growing number of elite(卓越的) institutions, including Stanford and New York Univer sity are beginning to offer on line courses. The benefits for busy people are obvious. “I always get a front row seat,” says one student studying at the State University of New York Learning Network. “I can get up in the middle of class, grab a cup of coffee. The class is waiting for me when I get back, and I haven’t missed a thing.” On the other hand, some students miss the face to face interaction that often sparks interest and involvement. Generally speaking, on line education costs ____.

A. more than the traditional one
B. less than the traditional one
C. as much as the traditional one
D. the author hasn’t mentioned

采用Go-baCk-N滑动窗口机制，若帧序号采用3位二进制编码，则发送窗口最大尺寸为（）

A. 4
B. 6
C. 7
D. 8

某信道的带宽为4MHz，假定无噪声并采用4电平的数字信号，试求该信道的最大数据传输率。(要求列出简要计算式)