Why is it necessary to extend ventilators of gasoline powered vessels to the bilges ________．A.To keep them dry，and thus easier to cleanB.To remove fuel vapors which are heavier than airC.To provide adequate air to the enginesD.To cool the machinery areas
Why is it necessary to extend ventilators of gasoline powered vessels to the bilges ________．
A.To keep them dry，and thus easier to clean
B.To remove fuel vapors which are heavier than air
C.To provide adequate air to the engines
D.To cool the machinery areas
相关考题：
Why was John’s company interested in using Miller’s trademark() A. The trademark is very famous around the world.B. They need to extend their business scope.C. They hope to set up a branch.
Power operated cranes used on a ship must not be powered by ______.A.diesel engineB.chargeable batteriesC.electric motorsD.gasoline engines
If it becomes necessary to pump bilges while a vessel is in port, which of the following procedures should be followed?A.Pump only if the discharge is led to a shore tank or bargeB.Pump only during the hours of darknessC.Pump only on the outgoing tideD.Pump only as much as is necessary
Upon completion of fueling a gasoline driven vessel it is necessary to ______.A.keep ports，doors，windows，and hatches closedB.start engines immediatelyC.ventilate before starting engineD.None of the above
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Before starting a gasoline engine on a motorboat，you should make sure for safety that ______．A.The gasoline tank is fullB.The bilges，cabins，etc．are thoroughly ventilatedC.You have fresh water on boardD.Each of the above is followed
Vessels required to be equipped with an approved backfire flame arrester are ______．A.Those with diesel enginesB.All those with gasoline enginesC.Those with large engines onlyD.None of the above
A vessel brought alongside should be fended off the towing vessel by ______.A.crew members using their armsB.crew members using the strong muscles of their legsC.fendersD.No fending is necessary due to the rugged construction of most towing vessels
沥青用于污水舱和尖舱。（）A、Bitumen is used in bilges and peak tanks.B、Paint is used in bilges and peak tanks.C、Bitumen is used in bilges and double bottom tanksD、. Varnish is used in bilges and peak tanks.
If there is a fire in a hold, what should you do?（）A、Close the hatch, accesses and ventilators at once. Flood CO2 into hold.B、Open the hatch, accesses and ventilators at once. Flood CO2 into hold.C、Close the hatch, accesses and ventilators at once. Flood water into hold.D、Open the hatch, accesses and ventilators at once. Flood water into hold.
单选题Oil is a nonrenewable resource, whereas sunshine is limitless. So why not run cars on solar power? Because a car powered by solar collecting panels would be fine on a sunny day, but as soon as the sun went behind a cloud, the car would no longer function. Which of the following is presupposed in the argument against running a car on solar power?ASolar power is cleaner than fossil fuels, and it involves less geopolitical risk.BIn most of the northern hemisphere, it can be expected that more than 150 days a year will be cloudy.CNo system exists for storing solar energy for a car’s use when the car is not in direct sunlight.DNo one has yet introduced a commercially viable process for mass-producing solar cells that convert more than 10 percent of incoming sunlight into usable energy.EConsumers accustomed to the rapid acceleration of gasoline-powered cars will not accept the weak acceleration of solar-powered cars.
判断题______The purpose of this passage is to explain why it is necessary for us to help others.A对B错
单选题There are two classes of vessels which，to the extent necessary to carry out their work，do not have to comply with the rule regarding traffic separation schemes. One of these is a vessel（）.Aengaged in fishing in a traffic laneBservicing a submarine cableCtowing anotherDengaged on pilotage duty
单选题Before starting a gasoline engine on a motorboat，you should make sure for safety that（）.Athe gasoline tank is fullBthe bilges，cabins，etc. are thoroughly ventilatedCyou have fresh water on boardDEach of the above is followed
单选题The information on ocean voyage planning with routeing details for powered and sailing vessels is likely found in（）.AOcean Passages for the WorldBSymbols and Abbreviations used on Admiralty Charts，Chart 5011CWeekly Admiralty Notices to MarinersDThe Mariners Handbook
单选题A vessel brought alongside should be fended off the towing vessel by（）.Acrew members using their armsBcrew members using the strong muscles of their legsCfendersDNo fending is necessary due to the rugged construction of most towing vessels
单选题When two vessels are in immediate danger of collision，the stand-on vessel must（）.Aabandon shipBassist in taking whatever action is necessary to avoid collisionChold course and speedDsound a distress signal
单选题沥青用于污水舱和尖舱。（）ABitumen is used in bilges and peak tanks.BPaint is used in bilges and peak tanks.CBitumen is used in bilges and double bottom tanksD. Varnish is used in bilges and peak tanks.
单选题Starting motors，generators，and other spark producing devices should be mounted as high above the bilges as possible to（）.Akeep them dry when the bilges are full of waterBkeep them cool when the vessel is underwayCmake them more accessible for repairsDprevent accidental ignition of any gasoline vapors that may have accumulated in the bilges
单选题Upon completion of fueling a gasoline driven vessel it is necessary to（）.Akeep ports，doors，windows，and hatches closedBstart engines immediatelyCventilate before starting engineDNone of the above
单选题If it becomes necessary to pump bilges while a vessel is in port, which of the following procedures should be followed?（）APump only if the discharge is led to a shore tank or bargeBPump only during the hours of darknessCPump only on the outgoing tideDPump only as much as is necessary
单选题Which statement is TRUE concerning the ventilation of engine and fuel tank compartments on uninspected towing vessels using fuel with a flash point of 100°F?（）AThere shall be at least 3 ventilator ducts open to the atmosphereBAt least one exhaust duct shall extend from the open atmosphere to the lower portion of the bilgeCAt least one intake duct shall extend from the open atmosphere to the lower portion of the bilgeDOnly vessels using fuel with a flash point above 110°F need ventilate engine and fuel compartments
单选题The reason why more and more of the large merchant vessels are being powered by medium-speed diesel engines is （）.Athey operate between 150 and 450 rpmBthey are connected to the propeller by gearingCtheir smaller size and weightDthey can be connected directly to the propeller without gearing
单选题Vessels required to be equipped with an approved backfire flame arrester are（）.Athose with diesel enginesBall those with gasoline enginesCthose with large engines onlyDNone of the above
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