A.a tug comes alongside while the tanker is loading grade
B.and E cargoes B. a large，fresh oil spill is discovered immediately adjacent to the side of the tanker
C.there is an electrical storm in the vicinity
D.there is a fire on the dock or on a nearby vessel
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A.was experienced
B.were experienced
C.has experienced
D.have experienced
A.rotor blades and landing gear
B.unloading of passengers
C.loading of cargo
D.pilot's visibility
A.prevent the generation of flammable or combustible gas in tanks
B.blow out cargo lines to prevent the build up of gas concentrations
C.dilute tank atmospheres to keep gas concentrations below the lower explosive limit
D.prevent fires in the pumproom by continually displacing flammable vapors
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
A.with
B.has
C.have
D.had
最新試題
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