6. ______ is a life saving device onboard ships that can be either of the rigid or inflatable type. If in
the inflatable type, it has a protective canopy to preserve the lives of persons in distress when
abandoning vessels.
(A) Lifejacket
(B) Lifeboat
(C) Liferaft
(D) Lifering
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題目中的關鍵字inflatable 就是...
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6. ______ is a life...
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