单项选择题
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
Fixed piping leads from the（）to various areas of the co...
单项选择题Fixed piping leads from the（）to various areas of the compartment to be flooded.
A.manifold B.remote pull box C.discharge nozzle D.machinery space
When the ship is under attack by pirates,or terrorists,...
单项选择题When the ship is under attack by pirates,or terrorists,（）needs to be activated.
A.AIS B.SSAS C.SSP D.SART
Which of following physical abilities is not required a...
单项选择题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
