单项选择题
A.unstabilized display
B.stabilized display
C.composition display
D.relative display
单项选择题 A radar contact will remain stationary on a relative motion radar display only when it is（）.
单项选择题 A FICTIVE LINE DISPLAYED ON THE RADAR SCREEN SEPARATING THE FAIRWAY FOR INBOUND AND OUTBOUND VESSELS SO THAT THEY CAN SAFELY PASS EACH OTHER defines（）.
单项选择题 A Doppler speed log indicates speed over ground（）.