航海英语海上搜索单项选择题每日一练(2018.11.03)

单项选择题
Downwind for 1 miles，alter to starboard 90 degrees，go down this course for 1 mile；Then alter 90 degrees to starboard and go down this course for 2 miles；Then alter 90 degrees to starboard and go down this course for 2 miles；Keep adding 1 mile ever time you alter to starboard．This operation is（）search pattern
A.Williamson Turn
B.Parallel
C.Sector
D.Expanded
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
Which is the proper method of determining whether a portable CO2 fire extinguisher needs recharging?（）
A.Check the tag to see when the extinguisher was last charged
B.Release a small amount of CO₂; if the CO₂ discharges，the extinguisher is acceptable
C.Weigh the extinguisher and compare the weight against that stamped on the valve
D.Recharge the extinguisher at least once each year
单项选择题
If an airplane circles a vessel 3 times，crosses the vessel’s course close ahead while rocking the wings，and heads off in a certain direction，what does this indicate（）.
A.The plane is in distress and will have to ditch
B.The plane is going to drop a package and wishes the vessel to recover it
C.Someone is in distress in that direction and the vessel should follow and assist
D.There is danger ahead and the best course is indicated by the direction of the aircraft
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