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【单选题】
船舶发生海事时，（）必须将航海日志及有关海图妥善保存，弃船时要将航海日志带下，以供海事调查之用。A.
船长
B.
大副
C.
二副
D.
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举一反三
【单选题】there are two types of vibrations, they are vertical vibration and vibration.
A.
horizontal
B.
lateral
C.
vertical
D.
longitudinal
【单选题】The vertical angle between the horizontal and the magnetic line of force is the（）.
A.
elevation
B.
magnetic angle
C.
vertical angle
D.
dip
【单选题】A single vertical magnet placed underneath the compass in the binnacle is used to compensate for（）.
A.
the horizontal component of the permanent magnetism
B.
deviation caused by the vessel's inclination from the vertical
C.
induced magnetism in the horizontal soft iron
D.
induced magnetism in the vertical soft iron
【单选题】A single vertical magnet placed underneath the compass in the binnacle is used to compensate for ______．
A.
The horizontal component of the permanent magnetism
B.
Deviation caused by the vessel's inclination from the vertical
C.
Induced magnetism in the horizontal soft iron
D.
Induced magnetism in the vertical soft iron
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