阿摩線上測驗
13. In order to prevent the danger of the total blackout onboard ships, ______ should always be in readiness for operation.
(A) emergency escape
(B) emergency generators
(C) fire fighting
(D) watertight doors
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統計： A(176), B(440), C(83), D(49), E(0) #2999687
統計： A(176), B(440), C(83), D(49), E(0) #2999687