When a pushing vessel and a vessel being pushed are rigidly connected in a composite unit，they shall be regarded as（）.<br>A:a tugboat<br>B:a sailing vessel<br>C:a power-driven vessel<br>D:a vessel propelled by machinery and under sail

When a pushing vessel and a vessel being pushed are rigidly connected in a composite unit，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

出自：海船船员证

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