acoustic impedance
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1、A vessel not to impede the passage of
A vessel not to impede the passage of another vessel is not relieved () taking collision-avoiding action.AonBofCinDfor
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acoustic stapedius reflex
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3、A vessel engaged in()shall not impede
A vessel engaged in()shall not impede the passage of any other vessel navigating within anarrow channel or fairway.Amine clearance operationBtowing operationCdredging or surveying or underwater operationDfishing
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阻抗复合消声器impedance muffler
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5、A sailing vessel shall not impede the
A sailing vessel shall not impede the safe passage of a().Apower-driven vessel following a traffic laneBpilot vessel enroute to a pilot stationClaw enforcement vesselDAll of the above