阿摩線上測驗
20.When your ship is proceeding to the area of traffic density, _____is used to determine the exact range of other ships or objects in the vicinity.
(A)RADAR
(B)GPS
(C)Inmarsat-C
(D)GMDSS
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統計： A(160), B(13), C(19), D(14), E(0) #625178
統計： A(160), B(13), C(19), D(14), E(0) #625178
