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【单选题】When a pushing vessel顶推船 and a vessel being pushed被顶推船 are rigidly connected in a composite unit组合体, they shall be regarded as _________.
A.
a tugboat
B.
a sailing vessel
C.
a power-driven vessel
D.
a vessel propelled by machinery and under sail
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【单选题】When a pushing vessel顶推船 and a vessel being pushed被顶推船 are rigidly connected in a composite unit组合体, they shall be regarded as _________.
A.
a tugboat
B.
a sailing vessel
C.
a power-driven vessel
D.
a vessel propelled by machinery and under sail
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