单项选择题
When the density of water is 1000,i.e.in fresh water and in summer zone a ship may load to the upper edge of the line marked（）.
A.S
B.T
C.W
D.F
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When a ship in winter zone and in seawater of density1025,she must not load to more than the upper edge of the line marked（）.
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单项选择题
When a ship is in summer zone and in seawater of density1025,she must not load to more than the upper edge of the line marked（）.
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