单项选择题

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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单项选择题All ships（）suspected infectious disease on board should radio information to Port Health Officer.

A.with
B.has
C.have
D.had

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A.Apply ice-cold compress and renew every 4 hours
B.Commence artificial respiration immediately
C.Give enema
D.Pass catheter into bladder

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B.have proper air/gasoline fuel mixture ratio
C.be liquid- and vapor-tight
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B.When going directly from full ahead to full astern，there is complete steering control
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A.annular blowout preventer
B.annulus
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D.automatic choke