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
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相关考题
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单项选择题
At the master gyrocompass，the compass card is attached to the（）.
A.spider element
B.sensitive element
C.link arm
D.pickup transformer -
单项选择题
Before switching on gyro-compass，you should make sure that the power supply on board is（）.
A.high or low
B.AC or DC
C.strong or weak
D.on or off -
单项选择题
Calibration Stations give special transmissions for the calibration of ship’s（）.
A.gyro-compass
B.marine radar
C.DF
D.navigational satellite
