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

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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