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單項(xiàng)選擇題

A vessel engaged in（）shall not impede the passage of any other vessel navigating within anarrow channel or fairway.

A.mine clearance operation
B.towing operation
C.dredging or surveying or underwater operation
D.fishing

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單項(xiàng)選擇題

A vessel aground would show the same dayshape as a（）.

A.vessel towing a submerged object
B.dredge underway and dredging
C.hydrographic survey vessel at anchor and surveying
D.None of the above

單項(xiàng)選擇題

A survey (special purpose mark) buoy（）.

A.must be lighted
B.may have a flashing red light
C.may have a fixed white light
D.None of the above

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