单选题Duty officer and （）keep navigational watches on the bridge at sea.AseamanBsailorCduty sailorDOS
单选题
Duty officer and （）keep navigational watches on the bridge at sea.
A
seaman
B
sailor
C
duty sailor
D
OS
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Duty officer and keep navigational watches on the bridge at seaA.seamanB.sailorC.duty sailorD.OS
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