单选题Most modern Loran-C receivers，when not tracking properly，have a（n）（）.ABell alarm to warn the userBLighted alarm signal to warn the userCAlternate signal keying systemDView finder for each station
单选题
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
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