单项选择题
A compass card without north-seeking capability that is used for relative bearings is a(n)（）.
A.bearing circle B.pelorus C.bearing bar D.alidade
单项选择题 （）is on the panel of DF.
单项选择题 Quadrantal error in a gyrocompass has its GREATEST effect（）.
单项选择题 As a vessel changes course to starboard，the compass card in a magnetic compass（）.
