A.with
B.to
C.for
D.of
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A.at obscured objects
B.forward submerged targets
C.up exposed targets
D.for unseen objects
A.to be sailing
B.sailing
C.sail
D.to sail
A.in
B.of
C.on
D.with
A.cargo elevators
B.conveyor belts
C.ramps
D.derricks and winches for cargo handling
A.must
B.ought to
C.have to
D.never
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When the wave period and the apparent rolling period are the same（）.
When steering by autopilot,how often should the steering be checked?（）
Bales close to the deckhead should be covered to prevent（）.
Despite the rising importance and great convenience of the gyrocompass,the magnetic compass still retain its importance because of its（）.
（）is on the panel of radar.
（）is where the crew eat their meals.
Fog is likely to occur when there is little difference between the dew point and the（）.
The dew point temperature is（）.
Shipboard Emergency Drills must be carried out at least（）on board cargo ship.
The loading of the ship must be done in accordance with（）.