A.21-Aug-99
B.21-Sep-99
C.Octoer 31，1999
D.31-Dec-99
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A.Flinders bar
B.transverse magnets
C.fore-and-aft magnets
D.soft iron spheres on the sides of the compass
A.true meridian and the axis of the compass card
B.true meridian and the magnetic meridian
C.magnetic meridian and the axis of the compass card
D.axis of the compass card and the degaussing meridian
A.vessel's geographic position
B.vessel's heading
C.earth's magnetic field
D.influence of the magnetic materials of the vessel
A.deviation minus variation
B.variation plus compass course
C.combined variation and deviation
D.difference between true and magnetic heading
A.magnetism from the earth's magnetic field
B.misalignment of the compass
C.magnetism within the vessel
D.a dirty compass housing
最新試題
Most modern Loran-C receivers，when not tracking properly，have a（n）（）.
Would you please（）on the radar?
（）is not an alarm required by IMO standards to be available on the ECDIS.
（）is not a component of GPS.
Would you mind（）your DF?
The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of（）.
If the radio signal ground wave extends out for less distance than the minimum skywave distance，there is an area in which no signal is received．This is called the（）.
The operation of which aids to navigation may be suspended during war or national emergency（）.
The heading of a vessel is indicated by what part of the compass? （）
The correction to be applied to a Loran-C reading when matching a sky wave to a ground wave may be found（）.