Heavy fuel oils when spilled are ______.A.more harmful to sea life than lighter oilsB.easier to clean up than lighter refined oilsC.less harmful to sea life than lighter oilsD.not a real threat to marine life
Heavy fuel oils when spilled are ______.
A.more harmful to sea life than lighter oils
B.easier to clean up than lighter refined oils
C.less harmful to sea life than lighter oils
D.not a real threat to marine life
相关考题：
When the ships is going to enter into the harborA.change from heavy fuel oil to diesel oil for main engineB.pumping out bilge waterC.change sea chest form high level one to lower level oneD.test emergency generator
单选题When the ship is going to enter into the harbor,（）Achange from heavy fuel oil to diesel oil for mail engineBpumping oil bilge waterCchange sea chest form high level one to lower oneDtest emergency generator
单选题Heavy fuel oils generally have an upper average ash content of 0~1% by weight.Which of the following conditions could be expected if the ash content increase above this amount?（）AGlazing of the cylinder linersBIncrease valve wearCExcessive oil pumpingDIncrease fuel consumption
单选题When the opening pressure of a diesel fuel injector is greater than that specified by the engine manufacturer，the （）Aquantity of fuel injected is decreasedBquantity of fuel injected will always be increasedCstart of injection is advancedDduration of injection will always be greater
单选题Heavy residual fuel oils are heated prior to centrifuging to （）Areduce fuel weightBincrease specific gravityCseparate fuel from lube oilDreduce fuel viscosity
单选题The needle valve in a fuel valve will （） when the fuel pressure action on the needle valve tapered face exerts a force lower than that of the spring compression.Abe jammedBbe openedCbe seatedDbe broken
单选题A small fuel spillage has occurred during helicopter refueling. After the leak has been stopped and fire-control personnel have been notified and are standing by，the next step is to（）.Aproceed with fueling operationBhave helicopter move to a safer locationCwash spilled fuel away with a flood of waterDclean spilled fuel with rags
单选题When centrifuging heavy fuel oil, an important factor to consider is the （） (1) flow rate (2) viscosity of the fuel oilA(1) only is correctB(2) only is correctCboth (1) and (2) are correctDneither (1) or (2) are correct
单选题When running before a heavy sea，moving weights aft will affect the handling of a vessel by （）.Areducing rollingBincreasing rollingCreducing yawingDincreasing yawing
单选题What generally occurs when the land is cooler than the nearby water? （）AA land breezeBA sea breezeCA northerDA prevailing westerly
单选题The treatment of the fuel oils involves storage, heating, filtering and（）AcentrifugingBpressurizingCatomizationDigniting
单选题When the opening pressure of a diesel engine fuel injector is greater than that specified by the engine manufacturer, which of the following problems can be expected?（）AQuantity of fuel injected tends to be decreasedBQuantity of fuel injected will always be increasedCStart of injection tends to be advancedDDuration of injection will always greater
单选题When preparing a ship for heavy weather，fuel oil day tanks should be（）.Apumped overboard to calm the seasBdrained to the lower hull to reduce free surfacesCfilled to ensure that sufficient fuel oil is available during a lengthy emergencyDpartially drained to increase free surfaces in order to reduce motions
单选题Heavy fuel oils when spilled are（）.Amore harmful to sea life than lighter oilsBeasier to clean up than lighter refined oilsCless harmful to sea life than lighter oilsDnot a real threat to marine life
单选题What color exhaust will be exhibited when a slow speed two-stroke/cycle main propulsion diesel engine, designed to operate on light and heavy fuel oil, is operated on insufficiently preheated heavy fuel oil?（）AWhiteBBlackCBlueDClear
单选题When ship navigating in rough sea, the first measure taken by the chief engineer to prevent the overload should be（）Acleaning fuel oil, lubricating oil and seawater filterBreducing fuel feeding of the main engine appropriately or reducing the pitch angle of propellerCusing low sea chestDclosing the skylight and the ventilation opening, which doesn’t affect the normal work of equipments
单选题The use of sinking and dispersing agents for the removal of surface oil is （）.Athe most common method used in the United StatesBtoo expensive for common useCgenerally safe to sea lifeDgenerally harmful to sea life
单选题What is the harmful effect of sulfur in a fuel?（）AIt causes excessive smoking and soot at low firing ratesBIt doesn’t readily burn when combined with oxygenCIt clogs fuel oil strainers more oftenDIt forms a corrosive acid when mixed with water or water vapor
单选题"Cast iron has poor corrosion resistance to sea water, especially in the presence of bronzes" Implies（）.Aeast iron is a cheap materialBcast iron can pollute sea waterCcast iron has mere corrosive than bronzes to sea waterDcast iron is more corrosive to sea water when it meets with bronzes
单选题When comparing different fuels for different engines, the ignition quality of diesel fuel oils becomes a less critical consideration as （）Athe amount of lube oil additives increaseBpiston speeds increaseCinjection pressure decreaseDengine speeds decrease
单选题When restarting a heavy fuel diesel engine that has been stopped for some time, the engine should（）Aincrease the starting air pressureBuse a higher than normal cranking speedCincrease the fuel injection pressureDuse a fuel having a lower ignition temperature
单选题（）is not a process of weathering of the oil spilled in the sea water.AEvaporationBDispersionCEmulsificationDDrifting
单选题When running a large, low-speed, main propulsion diesel engine on heavy fuel, which of the following precautions should be observed when switching back over to diesel oil?（）AThe diesel oil must never be allowed to mix with the heavy fuelBThe temperature of the fuel from the pre–heater should be gradually reduced after switching over the three–way valveCThe heating steam to the pre-heater should be secured as soon as the diesel fuel passes through the three-way valveDThe heating steam must be secured before the diesel oil passes through the three-way valve
单选题（） fuel oils （） lubricating oils require treatment before passing to the engine.ABoth；andBNeither；norCEither；orDBoth；or
单选题When ship navigating in rough sea, the correct operation is （）Anavigating with a low diesel engine speedBnavigating with a stable diesel engine speedCincreasing the efficiency of propellerDincreasing fuel injection
单选题When used to fight fire，carbon dioxide（）.Ais effective if used promptly on an oil fireBhas a greater cooling effect than waterCis lighter than airDis harmless to cargo and crew
单选题When the ships is going to enter into the harbor,（）.Achange from diesel oil to heavy fuel oil for mail engineBpump out bilge waterCchange sea chest form lower level one to high level oneDtest emergency generator