对NAVTEX接收设备的字符差错率要求是()A、小于或等于0.01B、小于0.04C、小于或等于2%D、输入信号电动势为2uV时,字符差错率小于4%...
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在NCT-60G终端设备中,接收到的遇险呼叫及遇险优先等级的电文...
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PSC检查时,与附件海岸电台进行DSC呼叫测试时,应使用优先级别...
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使用Inmarsat-B移动站进行电传通信,可以呼叫的用户有()...
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单边带接收机中,从中频信号中还原音频信号是采用下述电路()。...
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直接按C船站面板上的“DISTRESS”键发送的遇险报警,信息中...
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A船航行在太平洋,其B站识别码为341256789B船航行在印度...
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简述MF/HF SSB接收机采用的两次变频的高中频方案。...
Friday, September 16, 2022
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GMDSS船用MF/HF设备的频率稳定度(收发频率的误差)不得超...
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Friday, September 16, 2022
酸性蓄电池在充电过程中,电解液的密度要(),温度要()。...
Monday, September 12, 2022
Friday, September 16, 2022
在GMDSS的设备工作要求中,船舶在航行期间对EPIRB和SAR...
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