單項選擇題An inert gas system installed on a tanker is designed to（）.

A.aid in the stripping and cleaning of cargo tanks
B.increase the rate of discharge of cargo
C.force toxic and explosive fumes from a cargo tank to vent to the outside atmosphere
D.lower the oxygen levels inside cargo tanks, making explosion nearly impossible


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1.單項選擇題An inert gas system is designed to reduce the possibility of tank explosions by（）.

A.eliminating sparks and fire in the vicinity of cargo tanks
B.removing all hydrocarbon gases from the cargo tanks
C.blanketing cargo tanks with inert foam
D.reducing the oxygen concentration below levels necessary for combustion

3.單項選擇題An unstable upright equilibrium position on a vessel means that the mrtacenter is（）.

A.lower than the center of gravity
B.at the same height as the center of gravity
C.heigher than the baseline
D.on the longitudinal centerline

4.單項選擇題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

5.單項選擇題Anchors are prevent from running out when secured by the（）.

A.brake
B.devil's claw
C.pawls
D.All of the above