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單項選擇題

Date line passed eastbound,（）.

A.jumping over today
B.backing to yesterday
C.jumping over tomorrow
D.backing to the day before yesterday

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Deballasting a double bottom has what affect on KG（）.

A.KG is increased
B.KG is decreased
C.Kgis not affected
D.KG increases at light drafts and decrease at deep drafts

單項選擇題

Deficient oxygen content inside a chain locker can be detected with（）.

A.litmus paper
B.a combustible gas indicator
C.an oxygen breathing apparatus
D.an oxygen indicator

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