A.at
B.on
C.in
D.for
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A.with
B.in
C.to
D.on
A.for
B.with
C.to
D.on
A.till Friday
B.on Friday at the latest
C.until Friday afterwards
D.at Friday soonest
A.which
B.where
C.what
D.who
A.keep vessel afloating
B.refloat vessel listing to port
C.make vessel all-right
D.bring vessel upright
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A tide is called diurnal when（）.
ECDIS must be able to perform all of the following EXCEPT（）.
According to the relevant regulation, lifeboat should be powered by（）.
The mean draft of a ship is the draft（）.
（）is on the panel of radar.
What is it called when it is possible to ignite the vapour above the oil?（）
Manoeuvring information can not be obtained from（）.
The circulation around a low pressure center in the Northern Hemisphere is（）.
Bales close to the deckhead should be covered to prevent（）.
When steering by autopilot,how often should the steering be checked?（）