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单选题
（）is used to moor the ship to the seabed to keep it sationary.
A
The bulbous bow
B
The anchor
C
The bow thruster
D
The propeller
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AIS cannot be used to make passing arrangements because the use of the ship-to-ship text messaging feature in this way is prohibited
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officersB
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upC
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单选题The quartermasters（）steer the ship and help the officer keep lookout.A
dutyB
on dutyC
at dutyD
in duty
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