Which is the proper method of determining whether a por……

单项选择题Which condition is necessary for a substance to burn?（）

A.The temperature of the substance must be equal to or above its fire point
B.The air must contain oxygen in sufficient quantity
C.The mixture of vapors with air must be within the explosive range
D.All of the above

单项选择题When retrieving the survival craft，the winch operator should stop the winch and check（）.

A.that all personnel are seated in the craft
B.that the cable has not jumped any grooves on the drum
C.which way the wind is blowing
D.the hydraulic fluid level before lifting

单项选择题When jumping into water upon which there is an oil-fire，you should（）.

A.break the water surface with your hands when diving head-first
B.use your hands to hold your knees to your chest
C.cover your eyes with one hand while pinching your nose shut and covering your mouth with the other
D.enter the water at the bow or stern on the windward side of the vessel

单项选择题When joining a vessel，do not forget personal documents and your spectacles，and（）if necessary.

A.drug
B.remedy
C.medicine
D.healer

单项选择题When evacuating a seaman by helicopter lift，which statement is TRUE?（）

A.The vessel should be stopped with the wind dead ahead during the hoisting operation
B.Flags should be flown to provide a visual reference as to the direction of the apparent wind
C.The drop line should be grounded first then secured as close to the hoist point as possible
D.The hoist area should be located as far aft as possible so the pilot will have a visual reference while approaching