單項選擇題

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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單項選擇題

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

單項選擇題

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

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

The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of（）.

你可能感興趣的試題

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

The receiver uses（）satellites to compute latitude，longitude，altitude，and velocity．

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