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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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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

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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