首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
考研
As more people live closer together, and as they use machines to produce leisure, they find that their leisure, and even their w
As more people live closer together, and as they use machines to produce leisure, they find that their leisure, and even their w
admin
2011-10-20
21
问题
As more people live closer together, and as they use machines to produce leisure, they find that their leisure, and even their working hours, become spoilt by a byproduct of their machines—namely, noise. Noise is nowadays in the news; it has acquired political status, and public opinions are demanding, more and more insistently, that something must be done about it.
(46)
To control noise is to demand much self-discipline (annoyance arises often from lack of common courtesy) a sense of proportion (there is usually a conflict of interest if a noise is to be stopped), the expenditure of money (and it is far more economical to do this early rather than late), and, finally, technical knowledge.
Technical difficulties often arise from the subjective-objective nature of the problem. You can define the excessive speed of a motor-car in terms of a pointer reading on a speedometer. But can you define excessive noise in the same way? (47)
You find that with any existing simple "noise-meter", vehicles which are judged to be equally noisy may show considerable difference on the meter.
Though the ideal cure for noise is to stop it at its source, this may in many cases be impossible. The next remedy is to absorb it on the way to the ear.
(48)
Domestic noises may perhaps be controlled by forethought and courtesy, and industrial noises by good planning and technical improvement.
But if we are going to allow fast motor-cycles and heavy diesel lorries to pass continuously through residential and business districts, the community must decide on the control it needs to exercise, for in the long run it has got to pay for it. (49)
And if a nation is to take part in modern air trans port, it must enter into international agreements on the noise control measures it will impose at its airports-and here the cost of any real control is to be measured in millions of dollars.
Jet engines may be modified to reduce their noise level, or insulation from air traffic noise may be provided by the purchase of land around airports or the insulation of buildings. (50)
One estimate is that $5.7 billion would be required to equip all existing jet engines with noise control devices; however, considering the current state of the art, even taking this step will not reduce noise levels at all points to acceptable values.
Some combination of methods is probably necessary.
选项
答案
你会发现,被认为噪音相同的车辆在任何现有的简单"噪音计"上所显示的读数可能大不相同。
解析
转载请注明原文地址:https://jikaoti.com/ti/ti0RFFFM
0
考研英语一
相关试题推荐
Britain’sgardenershaverevealedoneoftheirgreatestpethates—otherpeople’scats.Okay,they’resadisticmurderers—butisi
Britain’sgardenershaverevealedoneoftheirgreatestpethates—otherpeople’scats.Okay,they’resadisticmurderers—butisi
Britain’sgardenershaverevealedoneoftheirgreatestpethates—otherpeople’scats.Okay,they’resadisticmurderers—butisi
Britain’sgardenershaverevealedoneoftheirgreatestpethates—otherpeople’scats.Okay,they’resadisticmurderers—butisi
Alotofpeoplebelievethattelevisionhasaharmfuleffectonchildren.Afewyearsago,thesamecriticismsweremadeofthe
Economistsbelievethatjobearningsinfluencechoiceofoccupation.Theyacknowledgethatpeopleplacevaryingemphasis【C1】____
Economistsbelievethatjobearningsinfluencechoiceofoccupation.Theyacknowledgethatpeopleplacevaryingemphasis【C1】____
Economistsbelievethatjobearningsinfluencechoiceofoccupation.Theyacknowledgethatpeopleplacevaryingemphasis【C1】____
Economistsbelievethatjobearningsinfluencechoiceofoccupation.Theyacknowledgethatpeopleplacevaryingemphasis【C1】____
随机试题
Smokingisconsidereddangeroustothehealth.Alltheshopsare【56】tosellcigarettestochildren.Ourtobacco-seller,Mr.Jo
葡萄球菌肺炎的主要临床表现有
患儿,男,3岁,因发热、咳嗽、痰较多以“支气管肺炎”收入院,为改善呼吸道分泌物黏稠所致的缺氧症状最好采取
既能润肺止咳,又能润肠通便的药物是()
施工作业交底的内容包括()。
下列属于证券投资基金市场服务机构的是()。
公有制经济和非公有制经济都是社会主义市场经济的重要组成部分,都是我国经济社会发展的重要基础。()
已知圆C与圆(x-1)2+y2=1关于直线x+y=0对称,则圆C的方程是().
NaturalMedicinesSinceearliestdays,humanshaveusedsomekindsofmedicines.Weknowthisbecausehumanshavesurvived.A
Indiansalwaysshake(摇)theirheadstheytalktoothers.【C1】______doesnothavethesamemeaning【C2】______"no".Ifsomeonewants
最新回复
(
0
)