单选题Your radar is set on a true motion display.Which of the following will NOT appear to move across the PPI scope（）.AEchoes from a buoyBOwn ship's markerCEcho from a ship on the same course at the same speedDEcho from a ship on a reciprocal course at the same speed
单选题
Your radar is set on a true motion display.Which of the following will NOT appear to move across the PPI scope（）.
A
Echoes from a buoy
B
Own ship's marker
C
Echo from a ship on the same course at the same speed
D
Echo from a ship on a reciprocal course at the same speed
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