15.Which sector means an area which cannot be scanned by the ship radar that is shielded by part of its superstructure, mast etc.?
(A) Big sector
(B) Blind sector
(C) Small sector
(D) Inert sector
(A) Big sector
(B) Blind sector
(C) Small sector
(D) Inert sector
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統計: A(0), B(11), C(2), D(2), E(0) #3325173
統計: A(0), B(11), C(2), D(2), E(0) #3325173