单项选择题

It may be found that，in certain circumstances，Radar Beacon can cause unwanted interference particularly（）.

A.at close range
B.at end on situation
C.at head on situation
D.at crossing situation

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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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Induced magnetism is found in（）.

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