In a （） the center screw is driven and

1、When a ship is in summer zone and in s

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（）.ASBTCWDF

2、A virtual rise in the center of gravit

A virtual rise in the center of gravity may be caused by（）.Afilling a partially filled tankBusing an on board crane to lift a freely swinging heavy objectCemptying a partially filled tankDtransferring ballast from the forepeak to the after peak

3、When a vessel is stationary and in a h

When a vessel is stationary and in a hogging condition，the main deck is under（）.Acompression stressBtension stressCshear stressDracking stre

4、When a ship is in tropical zone and in

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（）.ASBTCWDF

5、The center of flotation of a vessel is

The center of flotation of a vessel is（）.Athe center of volume of the immersed portion of the vesselBthe center of gravity of the water pla...

6、A(n)（）indicates that is serious and in

A(n)（）indicates that is serious and inmmediate danger for vessel, crew and passengers.Adistress alertBurgency messageCsafety messageDroutine message