首页
登录
职称英语
After going over some basic about hearing, the teacher will lead the students to
After going over some basic about hearing, the teacher will lead the students to
游客
2023-11-10
8
管理
问题
After going over some basic about hearing, the teacher will lead the students to [br]
I’m glad to see so many of you here. We’ve become really alarmed over the health center by the number of students we are seeing, who are experiencing hearing loss. (7) First, I want to go over some basic about hearing. Then we can take a look at our school environment and see if we can figure out some ways to protect hearing. (8) The leading cause of preventable hearing loss is excessive noise. Too much moderate noise for a long time or some types of intense noise for even a short time can damage hearing. Loudness is measured in units called decibels. One decibel is the lowest sound that the average person can here. (9) Sounds up to 80 decibels generally aren’t harmful. That’s noise like traffic on a busy street. But anything louder than 80 decibels, especially with continuous exposure, may eventually hurt your hearing. (10) Once you are up to around 140 decibels, that’s like a jet plane taking off, then you might even feel pain in your ears. And pains are sure sign that your hearing’s at risk. Even one exposure to a really loud noise at close range can cause hearing loss. So what you need to do is limit your exposure to harmful levels. If you pass along this handout, we can take a look at the decibel level of some common campus sounds. Notice how loud those horns are that people take to football games. They are really dangerous if blown right behind you. Now, let’s try to generate a list of damaging noises.
选项
A、excessive noise.
B、too much moderate noise for a long time.
C、intense noise for even a short time.
D、moderate noise for a short time.
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3173507.html
相关试题推荐
TheStudents’Unionofyouruniversityisplanningtoholdanartsfestivaln
As______clearfromhismanners,heisateacher.A、beingB、isC、tobeD、beenB关系分
Studentsinthisuniversityareforbidden______outofthemaingatesoftheun
Theteacherdidn’tknowwho______forthebrokenglass.A、blamedB、wouldblameC
Ibecameateacherunderbizarrecircumstances,butinretrospectitwasone
Ibecameateacherunderbizarrecircumstances,butinretrospectitwasone
Ibecameateacherunderbizarrecircumstances,butinretrospectitwasone
Highschoolandcollegestudentstodayarepushedsomuchinthedirectionofsp
Recentsurveysshowthatalotofcollegestudentsdownloadpapersfromthe
Mostofus,asstudents,arecarefulwithourmoneyindailylife:wecollec
随机试题
Atranslatormusthaveanexcellent,up-to-dateknowledgeofhissourcelang
[originaltext]Itlookslikeagreattimefore-mailbutalousytimefore-
_____,amanwhoexpresseshimselfeffectivelyissuretosucceedmorerapidlyt
[originaltext]Afishermanhookedagreatwhitesharkwhilefishingoffthe
排水盲管包括环(竖)向排水盲管、纵向排水盲管、横向排水盲管,地下水可以进入管内也
根据《房屋建筑与装饰工程工程量计算规范》GB50854—2013,防腐、隔热、保
导游为实施好合理安排的原则,应处理好的关系有()。A.根据旅游团成员不同的体质情
以下不属于共同账户的是()。A.“货币兑换” B.“被套期工具” C.“利润
朱砂安神丸的功用是A.镇心 B.安神 C.泻火 D.养阴
下列关于可转换公司债券在上海证券交易所发行时间的安排,叙述正确的().
最新回复
(
0
)