单项选择题

To obtain accuracy in fixing by DF，（）and three stations should be used.

A.Parallel bearings
B.Long-range bearings
C.Short-range bearings
D.Cross bearings

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单项选择题

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

单项选择题

The time interval between the transmission of signals from a pair of Loran-C stations is very closely controlled and operates with（）.

A.An atomic time standard
B.Daylight Savings Time
C.Eastern Standard Time
D.Greenwich Mean Time