Most modern Loran-C receivers，when not tracking properly，have a（n）（）.
- ABell alarm to warn the user
- BLighted alarm signal to warn the user
- CAlternate signal keying system
- DView finder for each statio
问题
Most modern Loran-C receivers，when not
参考解析：
分类：GPS、DF及LC的使用题库
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