單項選擇題

The fog is too thick. Don’t（）the radar.

A.switch on
B.switch off
C.close
D.open

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單項選擇題

（）time will the pilot be available?

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

單項選擇題

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

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