Most modern Loran-C receivers，when not tracking properly，have a（n）（）.<br>A:Bell alarm to warn the user<br>B:Lighted alarm signal to warn the user<br>C:Alternate signal keying system<br>D:View finder for each station

Most modern Loran-C receivers，when not tracking properly，have a（n）（）.
A:Bell alarm to warn the user
B:Lighted alarm signal to warn the user
C:Alternate signal keying system
D:View finder for each station

出自：海船船员证

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