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【单选题】
有关值班驾驶员的职责,下列说法正确的是__。1在驾驶台保持值班,不得离开驾驶台;2对船舶的安全航行负责,直到船长上驾驶台为止;3对为了航行安全而采取某种行动发生疑问及时通知船长。
A.
①②
B.
①②③
C.
①③
D.
②③
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