单选题A radar contact will remain stationary on a relative motion radar display only when it is（）.Aon the same course as your vesselBat the same speed as your vesselCon the same course and speed as your vesselDon a reciprocal course at the same speed as your vessel
单选题
A radar contact will remain stationary on a relative motion radar display only when it is（）.
A
on the same course as your vessel
B
at the same speed as your vessel
C
on the same course and speed as your vessel
D
on a reciprocal course at the same speed as your vessel
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