单项选择题

Error may be introduced into a magnetic compass by（）.

A.making a structural change to the vessel
B.a short circuit near the compass
C.belt buckles
D.All of the above

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单项选择题
Due to GPS roll over of the clock cycle，GPS receivers may give the wrong time and position or may lock up permanently on（）.

A.21-Aug-99
B.21-Sep-99
C.Octoer 31，1999
D.31-Dec-99
单项选择题
Deviation which is maximum on intercardinal compass headings may be removed by the（）.

A.Flinders bar
B.transverse magnets
C.fore-and-aft magnets
D.soft iron spheres on the sides of the compass
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