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(155), B(385), C(76), D(44), E(0) #2999687

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13. 為防止船上完全停電的危險,___...
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