单项选择题

It is dangerous for vessels without the use of radar（）the estuary.

A.to get
B.to approach
C.to proceed
D.to close

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单项选择题
Induced magnetism is found in（）.

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