21. A person designed to co-ordinate search and rescue operation within a special
area, the person is:
(A) MRCC
(B) MMSI
(C) OSC
(D) OWS
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統計: A(33), B(31), C(418), D(3), E(0) #1444674
統計: A(33), B(31), C(418), D(3), E(0) #1444674