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听力原文: (14)We've become alarmed over the health center by the number of students who are experiencing hearing loss. First, I want to go over some basics about hearing. Then we can take a look at our school environment and see if we can figure out some ways to protect hearing. (16) 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 by decibels. One decibel is the lowest sound the average person can hear. Sounds up to 80 decibels generally aren't harmful. That's noise like traffic on a busy street. But anything louder than 80 decibels may hurt your hearing. (15) Once you are up to 140 decibels, that's like a jet plane taking off, then you might even feel pain in your ears. Those 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. What is this passage talking about?
A.
Air pollution.
B.
Noise damage.
C.
Environment on campus.
D.
Solutions for pollution.
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举一反三
【判断题】基本点火提前角控制的目标是使发动机在各种负荷和转速下都有最佳的点火提前角。
A.
正确
B.
错误
【单选题】以下不属于心电图机常用的提高CMRR的技术是
A.
屏蔽驱动
B.
叠加平均
C.
电源浮置
D.
右腿驱动
【单选题】Behaviorism sees learning in terms of habit formation. The habits are formed by __________ and reinforced by repetition.
A.
habit formation
B.
imitation
C.
memorization
D.
pattern practice
【简答题】某市三个有限公司共同投资设立有限责任公司,以批发工业品为主要业务,甲公司出资10万元,乙公司提供场地,实际估价20万元,但乙公司虚报为价值30万元,丙公司是市政府下属企业,出资10万元现金,同时利用其和市政府的特殊关系,作价为20万元,计折合股份总额30万元。并按以上出资额约定分成比例,于是新成立的有限责任公司以注册资本70万元登记,取得营业执照。问:该有限公司能否成立?丙公司能否以其和市政府之间...
【单选题】下面html语句,让网页中正确表示一个只有一行一列的表格的语句是_____。
A.
表格
B.
表格
C.
表格
D.
表格
【单选题】单选题13在一定条件下,生活的薄壁组织细胞经过()可恢复分裂能力
A.
再分化
B.
脱分化
C.
细胞分化
D.
组织分化
【单选题】()是旅游接待服务的核心与细带。p25
A.
导游服务
B.
旅游服务
C.
旅游景点
D.
旅游交通
【单选题】Behaviorism basically believes in ______.
A.
motivation
B.
performance
C.
rewards
D.
human factors
【简答题】What is Behaviorism? 什么是行为主义论?
【单选题】4-2工程地质勘察报告分为文字和()两部分。
A.
数字
B.
图表
C.
表格
D.
格式
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