A.whatB.WhenC.At whatD.At when（）time will the pilot be ……

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

单项选择题The pilot said he（）our vessel directly to berth.

A.will take
B.took
C.is taking
D.would take

单项选择题Mooring lines both（）were let go.

A.for and aft
B.from and aft
C.fore and aft
D.all and aft