A、navigational / typhoon
B、traffic / meteorological
C、marine / hurricane
D、navigational / meteorological
更多“The frequency 518KHZ will be used to transmit（）and（）wanings in NAVTEX.”相关的问题
A、处理518kHz的信号，还原1785kHz和1615kHz的信号 B、接收518kHz的信号，进行放大 C、将1785kHz和1615kHz的模拟信号转化成数字信号 D、将数字信号转化成1785kHz和1615kHz的模拟信号
A、If no answer is received on the designated distress frequencies，repeat the distress call on any frequency available B、Channel 16 (156.8) may be used for distress messages C、It is advisable to follow a distress message on 2182 kHz by two dashes of 10 to 15 seconds duration D、Distress messages should first be transmitted on 2182 kHz
A、Distress messages should first be transmitted on 2182 kHz B、Channel 16 (156.8 MHz) may be used for distress messages C、If no answer is received on the designated distress frequencies，repeat the distress call on any frequency available D、It is advisable to follow a distress message on 2182 kHz by two dashes of 10 to 15 seconds duration
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