A.rain
B.frost
C.sleet
D.snow
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A.sea
B.current
C.tide
D.swell
A.above
B.below
C.equal to
D.uncertain
A.varies
B.maintains
C.Shifts
D.assembles
A.UK Hydrographic Office
B.IMO
C.International Hydrographic Organization
D.International Association of Classification society
A.Being mroe than 25 miles from shore
B.Only at night when it‟s dark
C.Being more than 6 miles from shore
D.Never
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（）is the act of allocating space to containers on board of a container ship in the order of the discharge ports.
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The dew point temperature is（）.
Full details of all lights and fog signals are shown on（）.
It is dangerous for vessels without the operational radar（）the estuary.
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