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
2024-10-05
30
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、140 decibels.
B、100 decibels.
C、80 decibels.
D、60 decibels.
答案
C
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3788072.html
相关试题推荐
Aftergoingoversomebasicabouthearing,theteacherwillleadthestudentsto
Aftergoingoversomebasicabouthearing,theteacherwillleadthestudentsto
Aftergoingoversomebasicabouthearing,theteacherwillleadthestudentsto
Aftergoingoversomebasicabouthearing,theteacherwillleadthestudentsto
Teachersneedtobeawareoftheemotional,intellectual,andphysicalchang
Teachersneedtobeawareoftheemotional,intellectual,andphysicalchang
Teachersneedtobeawareoftheemotional,intellectual,andphysicalchang
Teachersneedtobeawareoftheemotional,intellectual,andphysicalchang
Teachersneedtobeawareoftheemotional,intellectual,andphysicalchang
Teachersneedtobeawareoftheemotional,intellectual,andphysicalchang
随机试题
Economics[img]2012q1/ct_etoefm_etoeflistz_0192_20121[/img][br]Whatisthelect
Heredity(遗传)isnottheonlythingthatinfluencesourcolour.Whereandhow
[originaltext] Todaymostastronomersacceptthenotionthatgroupsofstarst
女,55岁。腹痛、寒战、高热3天。实验室检查:WBC15×109/L,N0.88
B
以下为非线性动力学方程的是A.Fick方程B.Noyes-Whitney方程C.
下列对逆转录酶的叙述中正确的是A.属依赖RNA的DNA聚合酶 B.具有RNA酶
财务公司要成为询价对象,除成立两年以上外,注册资本应不低于()亿元,最近()个月
下列关于网桥和交换机的说法,正确的是()。 A.网桥在网络层完成数据帧接收、
商业银行贷款业务流程一般为()。A.贷款申请、贷款审批、贷款调查、贷款发放、贷
最新回复
(
0
)