单项选择题
Induced magnetism is found in（）.
A.hard iron
B.soft iron
C.vertical iron only
D.horizontal iron only
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相关考题
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单项选择题
If several fixed navigational lights are visible at the same time，each one may be positively identified by checking all of the following EXCEPT what against the Light List?（）
A.Rhythm
B.Period
C.Intensity
D.Color -
单项选择题
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 -
单项选择题
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
