阿摩線上測驗
27. Under international maritime practice, a vessel receiving a valid distress signal has the ________ to assist and must proceed with all speed to the scene.
(A) option
(B) motion
(C) obligation
(D) preference
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統計： A(0), B(0), C(1), D(0), E(0) #3930860
統計： A(0), B(0), C(1), D(0), E(0) #3930860
