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

单项选择题

The receiver uses（）satellites to compute latitude，longitude，altitude，and velocity．

A.one
B.two
C.three
D.four