相关考题
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单项选择题
In navigation the abbreviation “DF” refers to（）.
A.Deep Flood
B.Direction Finder
C.Double Freeboard
D.Dangerous Fertilizer -
单项选择题
There are many navigational aids（）.
A.in chief engineer's room
B.in chief officer's room
C.on the bridge
D.on deck -
单项选择题
All entries in Logbook,（）made, must not be erased.
A.once
B.whether
C.previous
D.just
