首页
登录
职称英语
Scientists now tend to agree that the noise level for potential hearing loss
Scientists now tend to agree that the noise level for potential hearing loss
游客
2025-04-08
29
管理
问题
Scientists now tend to agree that the noise level for potential hearing loss begins at about 70 decibels. Some of them are very concerned because normal daily life often exposes people to noise levels of about 70 decibels even inside their homes. Cities have always been noisy, but noise is now spreading to areas that were quiet just a few years ago.
Clearly, something must be done or noise will seriously and permanently maim the population. Fortunately, the knowledge and methods to control noise already exist. As a matter of fact, this is one instance where the knowledge of control methods exceeds the knowledge about the effects on human life and on the environment.
There are two common means for control. The first is reducing noise at its source, and the second is changing the sound path by distance or by shielding.
The second approach is being used more often today as people become more aware of the danger of noise. New building codes require better sound insulation in homes and apartments. More and more towns are passing zoning ordinances that try to segregate noisy factories or airports from residential areas. Sound-absorbent materials and construction designed to block sound paths are slowly coming into use in offices and homes. New highways are being built to redirect traffic noise up and away from nearby areas. Aircraft are increasingly being required to use reduced-power flights around airports.
There are many examples of available noise control methods that are not being used. More flexible building codes would permits the use of quieter kinds of plumbing pipes. Sound-absorbent materials can reduce the noise of motors and engines. Power generators can be quieted with baffles, exhaust silencers, and sound absorbers. Truck tires can be made with quieter treads. In many cases, the most of building quieter machines is the same or only slightly higher than that of the current noisy ones. Even though the new jumbo jets, for example, are quieter than the older ones, yet they are more powerful and carry twice as many passengers.
All of these methods are only partial measures as noisy levels continue to rise. Most specialists in the field agree that much of the solution must come from eliminating some of the noise at its source, therefore saving through prevention the large costs of hearing loss. [br] The noise level for possible hearing loss begins at about______.
选项
A、30 decibels
B、70 decibels
C、100 decibels
D、none of the above
答案
B
解析
细节事实题。根据题干关键词noise level,hearing loss定位到原文首段首句。原句中的begins atabout 70 decibels与选项B对应。故答案为B。
转载请注明原文地址:http://tihaiku.com/zcyy/4031943.html
相关试题推荐
Wehavebeenhearing_____accountsofyourwork.A、favouredB、favourableC、favouri
Thescientistshaveabsolutefreedomastowhatresearchtheythinkitbestto__
Comparingthetimescalesbetweenmanyfluepidemics,scientistscan_____whenan
"Doesmoneybuyhappiness?It’ssometimessaidthatscientistshavefoundno
"Doesmoneybuyhappiness?It’ssometimessaidthatscientistshavefoundno
多数科学家这样认为,这项新技术正在对我们的生活产生积极影响,但是科学的发展决不应该以牺牲社会道德和人类的长期利益为代价。Mostscientistsbeli
Scientistsnowtendtoagreethatthenoiselevelforpotentialhearingloss
Scientistsnowtendtoagreethatthenoiselevelforpotentialhearingloss
Scientistsnowtendtoagreethatthenoiselevelforpotentialhearingloss
Scientistsgenerallyholdthatlanguagehasbeensolonginusethatthelength
随机试题
退还return;giveback
ManagerialFunctionsManagerialworktypical
小明妈妈说不要求孩子在学校考100分只要孩子开心,你怎么看?
证券公司从事融资融券业务,应当建立完备的融资融券业务( )。 Ⅰ.管理制度
A.麝香酮B.麻黄碱C.N-甲基酪胺D.泽泻醇E.茯苓多糖对肿瘤有细胞毒作用的中
2021年1季度批发和零售业增加值的同比增量约是租赁和商务服务业的多少倍
从所给的四个选项中,选择最合适的一个填入问号处,使之呈现一定的规律性: A.如
下列不属于进行定量化分析的数理工具的是( )。A.运筹学模型 B.概率统计方
关于我国项目前期各阶段投资估算的精度要求,下列说法中正确的是( )。A.项目建议
下列不是原发综合征疴隋进展的表现的是A.空洞形成 B.淋巴结支气管瘘致支气管内
最新回复
(
0
)