The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of（）.<br>A:High frequency pulses<br>B:Combinations of high and low frequency pulses<br>C:The same frequency for all stations in a chain<br>D:Varied long and short pulses

The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of（）.
A:High frequency pulses
B:Combinations of high and low frequency pulses
C:The same frequency for all stations in a chain
D:Varied long and short pulses

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