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Signal loss信号损耗
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LTE中『____』基于主同步信号和辅同步信号进行的。(What carries on basing on the main synchronized signal and the auxiliary synchronized signal in LTE system『____』.)
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用于LTE小区搜索的同步信号是『____』信号和『____』信号。(The synchronized signal for cell search in LTE is『____』signal. )
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2M仪表与被测系统连接好测试结果可显示 ()。
A.线路信号电平和误码分析。B.告警(Signal Loss、AIS、Frame. Loss、R选项格式：A.MRA)。C.线路信号频率。D.误码(Bit Error、Code Error、Frame. Error、CRC Error)。
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Click the Exhibit button. When designing a DWDM system with multiple amplified spans, a pre－amp is needed at Site B to (). (Choose three.)
A. offset the OADM loss at site bB. overcome the high multiplexer loss at site aC. amplify signal levels after the high loss through Fiber Span 1D. adjust add channels at site B to be at the same level as the passthrough channelsE. ensure that the per channel power is higher than the minimum needed for the post-amp at Site b
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识别信号、询问信号和回答信号英文词汇分别为（）。A、identit ysignal、reply signal、interrogation signalB、interrogation signal、identity signal、reply signalC、identity signal、interrogation signal、reply signalD、reply signal、identity signal、interrogation signal
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割接时以下哪种情况发生，高速环网网管必出现光放大器Automatic power reduction告警信息（）A、回损值低于24DB时B、回损值低于22.5DB时C、LOW RETURN LOSS告警发生时D、AMP LOSS OF SIGNAL告警发生时
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What is added to the MS sensitivity level to obtain the required signal strength, SSreq?（）A、Rayleigh fading margin.B、Rayleigh fading margin, interference margin, and body loss.C、Rayleigh fading margin and interference margin.D、Rayleigh fading margin and body loss.E、Interference margin and body loss.
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单选题割接时以下哪种情况发生，高速环网网管必出现光放大器Automatic power reduction告警信息（）A
回损值低于24DB时B
回损值低于22.5DB时C
LOW RETURN LOSS告警发生时D
AMP LOSS OF SIGNAL告警发生时
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单选题Which mechanism can you use to achieve sub-second failover for link failure detection when a switched Ethernet media is used and loss of signal is not supported by the link provider？（）A
OSPF standard hellosB
Cisco Discovery Protocol link detectionC
Bidirectional Forwarding DetectionD
Fast Link PulseE
autonegotiation
考题
单选题If your radiotelephone fails while underway，（）.A
You must visually signal oncoming vesselsB
You must immediately tie up in the nearest port until the radiotelephone is repairedC
You must anchor until the radiotelephone is repairedD
The loss of the radiotelephone must be considered in navigating the vessel
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名词解释题信号肽（signal peptide）
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