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

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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

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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

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An inland oil barge must have equipment available to remove an on-deck oil spill of at least（）.

A.one barrel
B.two barrels
C.five barrels
D.ten barrels