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
外语
A、It is extremely dangerous to fly in the dark. B、Noise regulations restrict the hours of airport operation. C、Some of its runwa
A、It is extremely dangerous to fly in the dark. B、Noise regulations restrict the hours of airport operation. C、Some of its runwa
admin
2013-06-02
66
问题
The economic costs of noise to society are several. Airports are currently operating at less capacity because of noise regulations which restrict their hours of operation.For instance, at Washington’s National Airport jet traffic is not allowed from 11 pm to 7 am. Other airports restrict the use of certain runways.One estimate is that noise restrictions reduce possible airport use by 20 percent.The profitable cargo trade is especially affected by night restrictions
In the case of airports,jet engines may be modified to reduce their noise level.One estimate is that $5.7 billion would be required to equip all existing jet engines with noise control devices.However, even taking this step will not reduce noise levels at a11 points to acceptable values.some combination of methods is probably necessary.
If all aircraft were made quieter by existing methods, there would be a number of economic benefits.An increase in airport capacity would occur. Property values near airports might rise.Transportation costs to and from airports could be reduced since the airports now could be located closer to population centers.
Much research still needs to be done on the economic aspects of noise reduction and noise effects, Although some of the effects of noise pollution are known,more must be discovered about its effects on health, productivity,property values and the quality of life.Furthermore,the cost of noise pollution to the economy as a whole needs to be investigated.The public must be alerted to the dangers and economic costs of noise pollution so that people may make intelligent choices and exert appropriate pressures.
选项
A、It is extremely dangerous to fly in the dark.
B、Noise regulations restrict the hours of airport operation.
C、Some of its runways are not in good condition.
D、Cargo planes produce more disturbing noises at night.
答案
B
解析
Why is there no jet traffic at Washington’s National Airport from 11 pm to 7 am?
转载请注明原文地址:https://kaotiyun.com/show/A767777K
0
大学英语六级
相关试题推荐
A、Hemadeithimself.B、Hehadacarpentermakeit.C、Heboughtit.alongtimeago.D、Hehadanoldonere-made.B从男士的回答中可找到答案。
Atlastsheleftherhouseandgottotheairport,______(不料却看到飞机正起飞).
A、Motivationandteamwork.B、Candospirit.C、Honestyandresponsibility.D、Hard-workingandcooperation.A细节推断题。女士询问男士对领导能力的看法时
A、It’squitenewadventuretravel.B、It’sverydangerousadventuretravel.C、It’squitesafeadventuretravel.D、It’straditiona
A、Havedinnerwithhim.B、Writethepaperforhim.C、Gotoclasseswithhim.D、Helphimwiththepaper.D选项均为原形动词开头,且含有with/for
A、Withtheirfather.B、Withtheirmother.C、Withtheirgrandparents.D、Partofthetimewithmother,partwithfather.B选项均为With
A、Theymaycrashbecauseofnaturedisastersorhumanfaults.B、Theworld’sweatherconditionsaregettingworse.C、Theairport
Manlivesincommunities.Hissocialexistencerestrictshis【B1】______incertaindirectionsandextendsitinothers.Society【B
Manlivesincommunities.Hissocialexistencerestrictshis【B1】______incertaindirectionsandextendsitinothers.Society【B
随机试题
tRNA转录后对核苷或碱基的修饰中不包括
旋覆花的功效是()海藻的功效是()
A.AgNO3硅胶柱色谱B.60%一65%H3PO4C.古拉尔试剂D.氧化铝柱色谱E.硅胶柱色谱分离α一细辛醚和β一细辛醚用
下列设备中,属于安全防范系统的入侵报警探测器有()。
在实合同的过程中,如果出现一方无法控制的,在签订合同前不能进行合理预防的、发生后又不能合理避免和克服的且不是主要归因于对方的情况,导致承包人发生损失的,可据此提出()的索赔。
研究表明,与房地产的使用性质相关的是房地产的()。
小万是某装卸公司的装卸工人,一天在上班时,因为暂时没有装卸工作要做,就到装卸货物的货堆上睡觉。他刚睡着就听见同事喊来活了,便在半睡半醒之间急忙往下爬,结果从货堆上摔下来造成上肢骨折。请问,小万的伤是否可以算作工伤()。
以雄辩和与青年智者问答而著名的教育家是柏拉图。()
Whenteachinghandwriting,onedifficultyisteachingtheleft-handedchild.Thetraditionalpolicyhasbeentopushallchildre
以下关于数据库与文件的对应关系叙述错误的是______。A)在外存中,数据库以文件形式组织,文件由逻辑记录组成,记录由多个域组成B)关系表在逻辑上由一系列元组组成,元组由多个属性组成C)每个元组可以用数据库磁盘文件中的一个逻辑记录来存储,记录包
最新回复
(
0
)