12. ______ is a compartment divided by the floors and keelsons between the inner and outer portions and is usually used as ballast tanks or fuel tanks.
(A) Afterpeak tank
(B) Forepeak tank
(C) Double bottom
(D) Double hull

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統計： A(37), B(31), C(577), D(97), E(0) #2108644

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私人筆記#7361958
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2. ______ 是由肋板和龍骨分隔的...
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私人筆記#3419518
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(C) Double bottom 重底...
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