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單項(xiàng)選擇題

There is a VHF set（）the front of the wheelhouse.

A.at
B.on
C.of
D.in

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單項(xiàng)選擇題

There is a drifting mine（）in position 21 degrees 31 minutes North 124 degrees 20 minutes East.

A.report
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單項(xiàng)選擇題

There is a（）mine in position 50°N，30°W.

A.drifting
B.drifted
C.drift
D.draft