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单选题
The treatment of the fuel oils involves storage, heating, filtering and（）
A
centrifuging
B
pressurizing
C
atomization
D
igniting
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第二篇Home HeatingCentral heating became popular only after the Civil War.Typically,coal-burning furnaces（火炉）fueled the early systems.Natural gas had developed into the leading fuel by 1960.Its acceptance resulted in part from its wide uses.Because it comes primarily from U.S.and Canadian fields , natural gas is also less vulnerable（脆弱的）than oil is to war.Oil remains the most important fuel in a few areas,such as New England.Electric heating dominates most areas with mild winters and cheap electricity,including the South and the Northwest.It was made popular at least in the South by the low cost of adding electric heating to new houses built with air-conditioning.Bottled gas,which is somewhat more expensive than utility gas,is the fuel of choice in rural areas not served by utility pipelines.Wood is the leading heating fuel in just a few rural counties.Home heating,which accounts for less than 7 per cent of all energy consumed in the U.S.,has had a commendable（值得赞扬的）efficiency record : from 1 978 to 1 997 , the amount of fuel consumed for this purpose declined 44 per cent despite a 33 per cent increase in the number of housing units and an increase in house size.TheU.S.Department of Energy,however,forecasts that energy used in home heating will rise by 14 per cent over the next two decades.That rise is small considering an expected 21 per cent increase in the number of houses and the trend toward larger houses.Natural gas and electricity will probably dominate the home heating market for the next two decades.Solar（太阳的）heating never became popular because of cost and limited winter sunlight in most areas;in 2000 only 47,000 homes relied on it.According to paragraph 3,energy consumed in home heating over the next two decades will increase byA:33 per cent.B:31 per cent.C:21 per cent.D:14 per cent.
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共用题干
第二篇Home HeatingCentral heating became popular only after the Civil War.Typically,coal-burning furnaces（火炉）fueled the early systems.Natural gas had developed into the leading fuel by 1960.Its acceptance resulted in part from its wide uses.Because it comes primarily from U.S.and Canadian fields , natural gas is also less vulnerable（脆弱的）than oil is to war.Oil remains the most important fuel in a few areas,such as New England.Electric heating dominates most areas with mild winters and cheap electricity,including the South and the Northwest.It was made popular at least in the South by the low cost of adding electric heating to new houses built with air-conditioning.Bottled gas,which is somewhat more expensive than utility gas,is the fuel of choice in rural areas not served by utility pipelines.Wood is the leading heating fuel in just a few rural counties.Home heating,which accounts for less than 7 per cent of all energy consumed in the U.S.,has had a commendable（值得赞扬的）efficiency record : from 1 978 to 1 997 , the amount of fuel consumed for this purpose declined 44 per cent despite a 33 per cent increase in the number of housing units and an increase in house size.TheU.S.Department of Energy,however,forecasts that energy used in home heating will rise by 14 per cent over the next two decades.That rise is small considering an expected 21 per cent increase in the number of houses and the trend toward larger houses.Natural gas and electricity will probably dominate the home heating market for the next two decades.Solar（太阳的）heating never became popular because of cost and limited winter sunlight in most areas;in 2000 only 47,000 homes relied on it.What fuel is the dominant fuel in New England?A:Gas.B:Electricity.C:Wood.D:Oil.
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共用题干
第二篇Home HeatingCentral heating became popular only after the Civil War.Typically,coal-burning furnaces（火炉）fueled the early systems.Natural gas had developed into the leading fuel by 1960.Its acceptance resulted in part from its wide uses.Because it comes primarily from U.S.and Canadian fields , natural gas is also less vulnerable（脆弱的）than oil is to war.Oil remains the most important fuel in a few areas,such as New England.Electric heating dominates most areas with mild winters and cheap electricity,including the South and the Northwest.It was made popular at least in the South by the low cost of adding electric heating to new houses built with air-conditioning.Bottled gas,which is somewhat more expensive than utility gas,is the fuel of choice in rural areas not served by utility pipelines.Wood is the leading heating fuel in just a few rural counties.Home heating,which accounts for less than 7 per cent of all energy consumed in the U.S.,has had a commendable（值得赞扬的）efficiency record : from 1 978 to 1 997 , the amount of fuel consumed for this purpose declined 44 per cent despite a 33 per cent increase in the number of housing units and an increase in house size.TheU.S.Department of Energy,however,forecasts that energy used in home heating will rise by 14 per cent over the next two decades.That rise is small considering an expected 21 per cent increase in the number of houses and the trend toward larger houses.Natural gas and electricity will probably dominate the home heating market for the next two decades.Solar（太阳的）heating never became popular because of cost and limited winter sunlight in most areas;in 2000 only 47,000 homes relied on it.The word "consumed" in paragraph 3 could be best replaced byA:used.B:burned.C:delivered.D:pumped.
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共用题干
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共用题干
第二篇Home HeatingCentral heating became popular only after the Civil War.Typically,coal-burning furnaces（火炉）fueled the early systems.Natural gas had developed into the leading fuel by 1960.Its acceptance resulted in part from its wide uses.Because it comes primarily from U.S.and Canadian fields , natural gas is also less vulnerable（脆弱的）than oil is to war.Oil remains the most important fuel in a few areas,such as New England.Electric heating dominates most areas with mild winters and cheap electricity,including the South and the Northwest.It was made popular at least in the South by the low cost of adding electric heating to new houses built with air-conditioning.Bottled gas,which is somewhat more expensive than utility gas,is the fuel of choice in rural areas not served by utility pipelines.Wood is the leading heating fuel in just a few rural counties.Home heating,which accounts for less than 7 per cent of all energy consumed in the U.S.,has had a commendable（值得赞扬的）efficiency record : from 1 978 to 1 997 , the amount of fuel consumed for this purpose declined 44 per cent despite a 33 per cent increase in the number of housing units and an increase in house size.TheU.S.Department of Energy,however,forecasts that energy used in home heating will rise by 14 per cent over the next two decades.That rise is small considering an expected 21 per cent increase in the number of houses and the trend toward larger houses.Natural gas and electricity will probably dominate the home heating market for the next two decades.Solar（太阳的）heating never became popular because of cost and limited winter sunlight in most areas;in 2000 only 47,000 homes relied on it.Natural gas didn't become the leading fuel untilA:1978.B:1960.C:1997.D:2000.
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Moving goods by rail often involves（）costs， particularly when the shipper or receiver lack direct rail access.A、transshipmentB、transportationC、handingD、storage
考题
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?（）A
Glazing of the cylinder linersB
Increase valve wearC
Excessive oil pumpingD
Increase fuel consumption
考题
单选题Heavy residual fuel oils are heated prior to centrifuging to （）A
reduce fuel weightB
increase specific gravityC
separate fuel from lube oilD
reduce fuel viscosity
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单选题The desirable properties of a marine fuel oil should include（）A
high flash point and high viscosityB
low flash point and high viscosityC
low heating value and high sulphur contentD
high heating value and low sulphur content
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单选题How must each storage tank for helicopter fuel on a ship be marked?（）A
DANGER - KEEP AWAYB
DANGER - EXPLOSIVE VAPORSC
DANGER - NO SMOKINGD
DANGER - FLAMMABLE LIQUID
考题
单选题Which of the following procedures should be carried out to permit the use of a crosshead engine with an inoperable after-cooler?（）A
Bypass the after-cooler to operate at speedB
Run at reduced speed until the cooler can be repaired or renewedC
Switch to diesel fuel and run at full speedD
Nothing need to be done due to the low heating value of heavy fuel
考题
单选题To receive oil residues from the purification of fuel and lubricating oils in the machinery spaces, what kind of tank(s) should be provided on board?（）A
bilge tankB
sludge tankC
overflow tankD
oil collecting tank
考题
单选题You are transferring fuel from the storage tanks to the day tanks by means of an electric fuel oil transfer pumpIf the pump motor catches fire, you would FIRST （）.A
secure the fuel manifoldB
shut off power to the pumpC
shut off the power ventilationD
spray water on the fire
考题
单选题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
考题
单选题Which of the following is true of the heating system of the Johnstown campus?A
The heat is supplied by human bodies only.B
The heat is supplied by both human bodies and other heat-emitting objects.C
The heat is supplied by both human bodies and conventional fuel.D
The heat is supplied by human bodies, other heat-emitting objects, and conventional fuel.
考题
单选题The safe rate of bunkering heavy fuel oil is directly related to the （）.A
type of fuel transfer pump aboardB
temperature of the fuel oil being receivedC
size of the fuel storage tanks ashoreD
distance from the fuel oil storage tanks ashore
考题
单选题With respect to diesel fuel, the ease with which a cold engine will start is dependent upon the（）A
ignition quality of the fuelB
high heating value of the fuelC
amount of carbon residue after combustionD
internal flow resistance in the injectors
考题
单选题Sludge formation in a diesel engine lube oil system is caused by（）A
carbonization of oils from the combustion chambersB
emulsions of lube oil and waterC
coagulation of unburned fuel below the piston ringsD
all of the above
考题
单选题When comparing different fuels for different engines, the ignition quality of diesel fuel oils becomes a less critical consideration as （）A
the amount of lube oil additives increaseB
piston speeds increaseC
injection pressure decreaseD
engine speeds decrease
考题
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?（）A
The diesel oil must never be allowed to mix with the heavy fuelB
The temperature of the fuel from the pre–heater should be gradually reduced after switching over the three–way valveC
The heating steam to the pre-heater should be secured as soon as the diesel fuel passes through the three-way valveD
The heating steam must be secured before the diesel oil passes through the three-way valve
考题
单选题（） fuel oils （） lubricating oils require treatment before passing to the engine.A
Both；andB
Neither；norC
Either；orD
Both；or
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