單項(xiàng)選擇題

（）time will the pilot be available?

A.what
B.When
C.At what
D.At when

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In navigation the abbreviation “DF” refers to（）.

A.Deep Flood
B.Direction Finder
C.Double Freeboard
D.Dangerous Fertilizer

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There are many navigational aids（）.

A.in chief engineer's room
B.in chief officer's room
C.on the bridge
D.on deck