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單項選擇題

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

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A survey (special purpose mark) buoy（）.
A.must be lighted
B.may have a flashing red light
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A gas-free certificate would usually be issued by a(n)（）.
A.CCS marine surveyor
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C.port engineer
D.MSA marine inspector