通信专业业务 - 题库学习平台

Which protocols are found in the network layer of the OSI refere

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For which type of connection should a straight-through cable be

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An asynchronous serial data link is said to be（）。

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What is the maximum recommended length of twisted-pair Ethernet

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Flight safety messages shall comprise messages concerning the sa

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"SVC QSP RQ C K BG BI" means to requset a diversion.（）

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"SS" is the priority indicator of distress messages.（）

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We use （）port to solve the distance problem in reporting sy

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What characteristics define the current-loop interface？）

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In reporting system ，we use the electrical level translator to（

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Which topology type is our Automatic Packet Reporting System is

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Automatic Packet Reporting System transmit signals through （

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The voice communications and visual display and delivered to the

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The voice communication record is presented in a form of a numbe

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The ATC Record/Relay system records the voice communications bet

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Each voice recorder has double power units、If one is broken down

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The voice recorder is consisted of the following except （）.

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In ATC systems，recorders are not used to kept（）.

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Which one can not be used to back up Voice recording（）.

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Voice recording should be kept for（） in ATC systems.

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