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單項(xiàng)選擇題

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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單項(xiàng)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

單項(xiàng)選擇題

Induced magnetism is found in（）.

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

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