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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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
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