單項(xiàng)選擇題In navigation the abbreviation “DF” refers to().
A.Deep Flood
B.Direction Finder
C.Double Freeboard
D.Dangerous Fertilizer
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1.單項(xiàng)選擇題There are many navigational aids().
A.in chief engineer's room
B.in chief officer's room
C.on the bridge
D.on deck
2.單項(xiàng)選擇題All entries in Logbook,()made, must not be erased.
A.once
B.whether
C.previous
D.just
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