单项选择题
A.are tracked on reciprocal bearings B.are tracked at the same range C.are tracked on the same bearing D.pass closely to each other
Vapor given off by a flammable liquid will burn when ig...
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
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
