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单选题
A loud clicking noise from the valve compartment of an operating diesel engine would indicate（）
A
worn valve seats
B
worn main bearing
C
excessive valve clearance
D
weak rocker arm springs
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共用题干
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共用题干
Music and DrivingListening to loud music while driving can seriously hamper reaction times and cause accidents,new research suggests.A Canadian study found people took up to 20% longer to perform physical and mental tasks to loud music .If motorists were delayed that long at the wheel they could suffer a fatal crash, warned the RAG Foundation,a British motoring organization.Edmund King,the RACFoundation's executive director,said the study showed that"not only is loud music a nuisance to other,it could also be the cause of accidents".Earlier research by the RAG Foundation found drivers were twice as likely to skip a red light while listening to music.In the Canadian study volunteers carried out tasks while listening to levels of noise varying from 53 decibels(equivalent to an office environment)to 95 decibels(equivalent to an oil rig).Researchers found reactions to be significantly decreased at higher noise levels for both physical and mental work.At 95 decibels reaction times to tasks that involve decision making plummeted（骤然减少）by 20%.Edmund King said:" The findings of the Canadian study are bad news for decibel-loving drivers,as they prove that not only is loud music a nuisance to others,it could also be the cause of accidents on the roads."Drivers are at even greater risk if they listen to music with a pounding beat rather than more relaxed tunes,according to experts.Conrad King,consultant psychologist to the foundation,said:"It is important that drivers choose their music carefully when driving,as up-tempo music has been shown to cause drivers to have double the amount of accidents as those listening to slower music."In general,if music is ahove 60 beats per minute,listeners experience a faster rate and increased blood pressure."It doesn't matter if you listen to opera,classical or the latest rave music.It's the speed of the beat that counts." It can be concluded that speed of the beat is the most important criterion when choosing the music for a driver.A: RightB: WrongC: Not mentioned
考题
Life gets noisier every day and very few people can free from noise of some sort or another.It doesn′t matter where you live--in the middle of a modem city,or a faraway village--the chances that you will be disturbed by jet aero planes,transistor radios,oil powered engines,etc.,are almost everywhere.We seem to be getting used to noise,too.Some people feel quite lonely without background music while they are working.
Scientific tests have shown that total silence can be very frightening experience for human beings.However,some people enjoy listening to pop music which is very loud,and this can do harm to their eardrums（耳鼓）.The noise level in some disco is far above the usual safety level for heavy industrial areas.
One recent report about noise and concentration（专心）suggested that although a lot of people say that any noise disturbs their concentration,what really affects their ability to concentrate is a change in the level of noise.It goes on to say that a background noise,which doesn′t change too much（music,for example）may even help people to concentrate.
"Background music"in the passage meansA.music played in the concert
B.a kind of noise coming into your ears
C.music which helps people to concentrate
D.music played while people are working
考题
Life gets noisier every day and very few people can free from noise of some sort or another.It doesn′t matter where you live--in the middle of a modem city,or a faraway village--the chances that you will be disturbed by jet aero planes,transistor radios,oil powered engines,etc.,are almost everywhere.We seem to be getting used to noise,too.Some people feel quite lonely without background music while they are working.
Scientific tests have shown that total silence can be very frightening experience for human beings.However,some people enjoy listening to pop music which is very loud,and this can do harm to their eardrums（耳鼓）.The noise level in some disco is far above the usual safety level for heavy industrial areas.
One recent report about noise and concentration（专心）suggested that although a lot of people say that any noise disturbs their concentration,what really affects their ability to concentrate is a change in the level of noise.It goes on to say that a background noise,which doesn′t change too much（music,for example）may even help people to concentrate.
From this passage,the pollution of noiseA.doesn't matter much
B.has become worse everywhere
C.has become better in big cities
D.has become better in villages
考题
There is a real possibility that these animals could be frightened，( )a sudden loud noise. A.being there
B.should there be
C.there was
D.there having been
考题
A technician receives a new printer for repair and the work order states that when powered on the printer makes a loud noise and will not print. Which of the following actions should the technician take？ （）A、Install new drivers on the computer.B、Install a new ink cartridge.C、Install a print head on the printer.D、Remove the packing tape from the print head.
考题
A user is reporting a loud grinding sound when the machine is powered on. The machine loadsinto windows and the user does not notice any performance issues. Which of the following is the MOST likely cause of the noise?（）A、PowersupplyfailureB、BadHDC、BadfanD、FaultyCD-Rom
考题
单选题（）can be used to prevent hydraulic system overloaded or keep the pressure of oil outlet from pump constant.A
Overflow valveB
Reducing valveC
Balancing valveD
Reducing valve or balancing valve
考题
单选题Fixed piping leads from the（）to various areas of the compartment to be flooded.A
manifoldB
remote pull boxC
discharge nozzleD
machinery space
考题
单选题Combustible material stored in a compartment adjacent to a compartment where there is a fire may be ignitedThis ignition can occur by （）.A
heat convection through the adjacent bulkheadsB
combustion gases carried through the ventilation systemC
direct convection of the heat emitted by the adjacent fireD
heat radiated from the dock or bulkhead by the adjacent fire
考题
单选题It is necessary to secure the forced ventilation to a compartment where there is a fire to（）.A
allow the exhaust fans to remove smokeB
extinguish the fire by carbon monoxide smotheringC
prevent additional oxygen from reaching the fireD
protect fire fighting personnel from smoke
考题
单选题The thermostatic valve has a throttling action, that is to say the valve can（）A
stop the refrigerant from flowingB
force the refrigerant to flowC
cause the refrigerant pressure to riseD
cause the refrigerant pressure to fall
考题
单选题A loud clicking noise from the valve compartment of an operating diesel engine would indicate（）A
worn valve seatsB
worn main bearingC
excessive valve clearanceD
weak rocker arm springs
考题
单选题While troubleshooting a refrigeration system for low head pressure, liquid refrigerant flooding back from the evaporator is determined to be the causeIt may be necessary to （）.A
change the expansion valve adjustmentB
readjust the water regulating valve to increase the flow of waterC
purge air from the condenserD
clean the waterside of the condenser
考题
单选题A loud noise （） my attention from cooking and everything was burnt.A
dividedB
divertedC
focusedD
separated
考题
单选题The low pressure side of a refrigeration system is considered to exist from the （）.A
expansion valve to the compressorB
receiver to the expansion coilC
expansion valve to the evaporatorD
condenser to the expansion valve
考题
单选题Valve cages are used on some large diesel engines to （）A
reduce wear on the valve stemB
permit the use of alloy valve seat materialsC
reduce heat transfer from the valve seatD
facilitate valve removal for servicing
考题
单选题The designer of the Sydney Opera House was from _____.A
AmericaB
AustraliaC
EnglandD
Denmark
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