单项选择题
Vapor given off by a flammable liquid will burn when ignited provided（）
A.the vapor and air mixture is too rich
B.it is mixed with certain proportions of air
C.the vapor is too little compared to the air
D.it is of heavy toxicity
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A.manifold
B.remote pull box
C.discharge nozzle
D.machinery space -
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When the ship is under attack by pirates,or terrorists,（）needs to be activated.
A.AIS
B.SSAS
C.SSP
D.SART -
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Which of following physical abilities is not required as to the routine movement around a vessel?（）
A.Maintain balance and move with agility
B.Climb up and down vertical ladders and stairways
C.Open and close watertight doors
D.Take part in vessel evacuation procedures
