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
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相关考题
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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 -
单项选择题
To obtain accuracy in fixing by DF cross bearings，（）should be used.
A.two stations，including one on the nearest coast
B.two stations，including one on the nearer coast
C.three stations，including one on the farthest coast
D.three stations，including one on the nearest coast
