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（）.

When a ship in winter zone and in seawater of density10...

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（）.

When a ship is in summer zone and in seawater of densit...

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（）.

When a ship is in tropical zone and in seawater of dens...

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（）.