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單項(xiàng)選擇題

Magnets in the binnacles of magnetic compasses are used to reduce the effect of（）.

A.deviation
B.variation
C.local attraction
D.All of the above

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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

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

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