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單項選擇題

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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單項選擇題

Induced magnetism is found in（）.

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

單項選擇題

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