A.switch on
B.switch off
C.close
D.open
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A.invisible
B.it is invisible
C.isn't visible
D.unvisible
A.repairing
B.to repair
C.repairs
D.have repaired
A.tide is falling from high water to low water
B.tide is rising from low water to high water
C.tide is reaching to a highest level
D.tide is reaching to a lowest level
A.is stayed
B.is situated
C.is placed
D.is located
A.the radio apparatus fitted on the portside
B.the radio with a portable equipment
C.the radio equipment which is easily movable
D.the portable radio with some apparatus
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Bales close to the deckhead should be covered to prevent（）.
Fog is likely to occur when there is little difference between the dew point and the（）.
ECDIS must be able to perform all of the following EXCEPT（）.
What is it called when it is possible to ignite the vapour above the oil?（）
In the Northern hemisphere northerly winds may cause temperature（）.
The ISM code is part of（）.
A tide is called diurnal when（）.
（）is halfway between the forward and after perpendiculars and is reference point for vessel construction.
Manoeuvring information can not be obtained from（）.
Which of the following shall not the officers in charge of the navigational watch do?（）