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單項(xiàng)選擇題

Calibration Stations give special transmissions for the calibration of ship’s（）.

A.gyro-compass
B.marine radar
C.DF
D.navigational satellite

單項(xiàng)選擇題

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

Before switching on gyro-compass，you should make sure that the power supply on board is（）.

你可能感興趣的試題

Calibration Stations give special transmissions for the calibration of ship’s（）.

To obtain accuracy in fixing by DF cross bearings，（）should be used.

To obtain accuracy in fixing by DF cross bearings，（）should be used.