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单选题
第三代移动通信系统也简称(),又被国际电联(International Telecommunication Union,ITU)称为IMT-2000(International Mobile Telecommunications in the year 2000),意指在2000年左右开始商用并工作在2000MHz频段上的国际移动通信系统。
A
B3G
B
2.75G
C
2G
D
3G
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考题
第三代移动通信系统也简称( ),又被国际电联(International Telecommunication Union,ITU)称为IMT-2000(International Mobile Telecommunications in the year 2000),意指在2000年左右开始商用并工作在2000MHz频段上的国际移动通信系统。
A. B3GB. 2.75GC. 2GD. 3G
考题
Network managers have long awaited practical voice-over-IP(VOIP)solutions. VOIP promises ease network management and decreases(66)by converging a company's telephony and data infrastructures into one network. And a VOIP solution implemented at a company's head-quarters with far-reaching branch offices can(67)tremendous amounts of money in long distance phone bills, provided that solution delivers POTS-like voice(68)over the Internet.VOIP gateways are designed to convert voice from the(69)domain to the circuit switched domain. VOIP solutions use a digital signal processor(DSP)to process the voice data, preparing the voice sample for transmission by compressing voice and removing jitter. The VOIP equipment must comply with the(70)H.323 standard defined by the International Telecommunication Union, or ITU.A.timeB.cashC.costsD.space
考题
Suppose your school is going to hold the Chinese Competition for International Students next month,Write for the StudentsJ Union a notice of about 100 words,providing relevant information about the competition.You should write neatly on the ANSWER SHEET.Do not sign your own name at the end of the letter.Use"Students'Union"insteacl.Do not write the address.(10 points)
考题
下面对4G描述不正确的是()A、4G就是第三代移动通信及其技术的简称B、4G是能够传输高质量视频图像的技术产品C、4G系统能够以100Mbps的速度下载D、4G比拨号上网快2000倍,上传的速度也能达20Mbps
考题
关于AFTN的全称是:()A、Aeronautical Fixed Telecommunication NetworkB、Airplane Fixed Telecommunication NetworkC、Aeronautical Fixed Telephone NetworkD、Airplane Fixed Telephone Network
考题
单选题下面对4G描述不正确的是()A
4G就是第三代移动通信及其技术的简称B
4G是能够传输高质量视频图像的技术产品C
4G系统能够以100Mbps的速度下载D
4G比拨号上网快2000倍,上传的速度也能达20Mbps
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