16. 當船舶從事拖曳作業時，依國際海上避碰規則定義，則該船屬下列何種船舶？
(A) Vessel not under command.
(B) Vessel restricted in her ability to maneuver.
(C) Vessel constrained by her draught.
(D) Vessel is not under way.

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統計： A(1), B(29), C(3), D(4), E(0) #1229137