56 A vessel engaged in laying, servicing or picking up a navigation mark, submarine cable, or pipe line shall
be regarded as a vessel _____.
(A)underway
(B)restricted in her ability to maneuver
(C)not under command
(D)under sail
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統計: A(2), B(9), C(1), D(2), E(0) #3221114
統計: A(2), B(9), C(1), D(2), E(0) #3221114