Laying out a line in successive circles flat on deck with the bitter end in the center is known as（）.

单项选择题In plugging submerged holes on a vessel，rags，wedges，and other materials should be used in conjunction with plugs to（）.

A.reduce the water pressure on the hull
B.reduce the water leaking around the plugs
C.prevent progressive flooding
D.reduce the possibility of stress fractures

单项选择题By definition，a spar deck is the（）.

A.lower most continuous deck not broken by water tight bulkheads
B.after most weather deck above the main strength deck
C.upper or weather deck above the main strength deck
D.deck of light construction below the main or strength deck

单项选择题Bulkheads which form part of the tanks on a vessel are stiffened to withstand（）.

A.deck loads from above
B.dynamic forces while afloat
C.hydrostatic pressure
D.over-pressurization

单项选择题Between the side frames on a vessel，support for the deck beams is provided by（）.

A.stanchions
B.brackets
C.web frames
D.deck stringers

单项选择题An upright vessel has negative GM. GM becomes positive at the angle of loll because the（）.

A.free surface effects are reduced due to pocketing
B.KG is reduced as the vessel seeks the angle of loll
C.effective beam is increased causing BM to increase
D.underwater volume of the hull is increased