单项选择题
The average of the forward and after drafts is the（）.
A.mean draft
B.true mean draft
C.mean of the calculated drafts
D.draft at the center of flotation
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The angle to which a floating ship，with a negative initial metacentric height，lies while at rest in still water is the angle of（）.
A.trim
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C.heel
D.loll -
单项选择题
Some cargoes are（）in weight but（）in size.
A.lighter／large
B.light／larger
C.lighter／larger
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