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

相关考题

Calibration Stations give special transmissions for the...

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

To obtain accuracy in fixing by DF cross bearings，（）sho...

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

To obtain accuracy in fixing by DF，（）and three stations...

单项选择题To obtain accuracy in fixing by DF，（）and three stations should be used.

A.parallel bearings
B.long-range bearings
C.short-range bearings
D.cross bearings

GPS、DF及LC的使用

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