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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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
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