A.the position is suitable
B.the position is reliable
C.the position is changeable
D.the position is fixable
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A.The two points are in low latitudes in the same hemisphere
B.The two points are in high latitudes in the same hemisphere
C.The two points are near the equator, but in different hemispheres
D.One point is near the equator, one point is in a high latitude, and both are near the 180th meridian
A.gale warning
B.24 hours forecast
C.synopsis
D.storm warning
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When steering by autopilot,how often should the steering be checked?（）
Fog is likely to occur when there is little difference between the dew point and the（）.
Shipboard Emergency Drills must be carried out at least（）on board cargo ship.
Which of the following is not an operation mode of AIS?（）
Despite the rising importance and great convenience of the gyrocompass,the magnetic compass still retain its importance because of its（）.