單項(xiàng)選擇題Induced magnetism is found in（）.

A.hard iron
B.soft iron
C.vertical iron only
D.horizontal iron only


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2.單項(xiàng)選擇題How is variation indicated on a small-scale nautical chart?（）

A.Magnetic compass table
B.Magnetic meridians
C.Isogonic lines
D.Variation is not indicated on small-scale nautical charts

3.單項(xiàng)選擇題Gyrocompass repeaters reproduce the indications of the master gyrocompass. They are（）.

A.accurate only in the Polar regions
B.accurate electronic servomechanisms
C.hand operated
D.accurate only if the vessel is underway

4.單項(xiàng)選擇題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