单项选择题
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（）.
A.S
B.T
C.W
D.F
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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（）.
A.S
B.T
C.W
D.F -
单项选择题
When a ship is in tropical zone and in seawater of density 1025,she must not load to more than the upper edge of the line marked（）.
A.S
B.T
C.W
D.F -
单项选择题
A horizontal the 450mm long and 25 mm wide cuts through the loadline disc.It is called the（）.
A.the deck like
B.plimssoll dise
C.plimssoll line
D.summer load line
