某接收天线增益为8DB,传输线损耗为3DB,路径传输损耗为102.5DB,其它损耗忽

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问题:

某接收天线增益为8DB,传输线损耗为3DB,路径传输损耗为102.5DB,其它损耗忽略,测得接收电平为-64.5DBm,则发射机的等效全向辐射功率为()DBm.

A.30

B.33

C.21

D.38

考点:通信工程师卫星通信卫星通信题库
题型:单项选择题

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.quality

B.frequency

C.length

D.quantity

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下列有关计算机犯罪的说法,不正确的是()。

A.包括针对计算机的犯罪,即把电子数据处理设备作为作案对象的犯罪,如非法侵入和破坏计算机信息系统等

B.包括利用计算机的犯罪,即以电子数据处理设备作为作案工具的犯罪,如利用计算机进行盗窃、贪污等

C.随着我国计算机应用和普及程度的提高,计算机犯罪呈下降态势

D.目前我国已发现的计算机犯罪作案领域,涉及银行、证券、保险、内外贸易、工业企业以及国防、科研等各个部门

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表象是什么?

题型:单项选择题

层面防水刷冷底子油的作用是()

A.增加一道防水层

B.加强沥青与找平层粘结

C.防止水分蒸发引起空鼓

D.保护找平层不受沥青侵蚀

题型:单项选择题

C组中的贸易术语适用于各种运输方式的是()

A.CFR和CPT

B.CIF和CIP

C.CFR和CIF

D.CPT和CIP

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