单选题The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of（）.AHigh frequency pulsesBCombinations of high and low frequency pulsesCThe same frequency for all stations in a chainDVaried long and short pulses
单选题
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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