单项选择题

______ is not an alarm required by IMO standards to be available on the ECDIS．
A.Deviating from a planned route
B.Approach to waypoints and other critical points
C.Light house detecting
D.Larger scale chart available

A.A.Deviating
B.Approach
C.Light
D.Larger
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单项选择题
A.B.C.D.无法判别
A.
B.
C.
D.无法判别
单项选择题
Most GPS receivers use the doppler shift of the carrier phase to compute ______．A.LatitudeB.LongitudeC.SpeedD.Time
A.A.Latitude
B.Longitude
C.Speed
D.Time
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