A.is
B.are of
C.is of
D.are
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A.should
B.must
C.shall
D.have to
A.has less strength than manila line
B.has more strength than manila line
C.is equivalent to manila line
D.will rot quicker than manila line
A.never leak but may be spoiled by leakage
B.sometimes leak and damage themselves
C.often leak and damage other cargo
D.neither leak nor will be damaged by leakage
A.the call sign and name
B.the official number and name
C.the port of registry and name
D.the port of registry and official number
A.has no right
B.has partial right
C.has the right
D.has not any right
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（）is where the crew eat their meals.
The helm command PORT TWENTY means（）.
Despite the rising importance and great convenience of the gyrocompass,the magnetic compass still retain its importance because of its（）.
The force resulting from the earth’s rotation that causes winds to deflect to the right in the Northern Hemisphere and to the left in the Southern Hemisphere is called（）.
The ISM code is part of（）.
The circulation around a low pressure center in the Northern Hemisphere is（）.
The loading of the ship must be done in accordance with（）.
A tide is called diurnal when（）.
（）is the act of allocating space to containers on board of a container ship in the order of the discharge ports.
When steering by autopilot,how often should the steering be checked?（）