解析 A 正确答案:A解析:由but表明前后是转折关系,即存在着对比。but之前的地点状语是at ground level,因而but之后用in the stratosphere,无论从结构上还是形式上均与at ground level对称。选A是正确的,B、D使but分句的句子结构不完整。E改变句意,而C与but之前的形式缺乏对应关系,表达啰嗦。 知识模块:语法改错...
Ozone is a highly oxidative compound and is one of the important pollutants present in the atmosphere and at ground level. Concentration of ground-level ozone (GLO) pollutant depends on different factors such as the amount of VOC and NOX, heat and location in the atmosphere. Ozone can cause ...
reaction between oxides of nitrogen (NOx) and volatile organic compounds (VOC) in the presence of sunlight. Ozone has the same chemical structure whether it occurs miles above the earth or at ground-level and can be "good" or "bad," depending on its location in the atmosphere. ...
地面上臭氧 一般被科学家认为是空气污染物的包括,地面上臭氧(ground-level ozone)、大污染粒子(coarse particles,直径2.5-10微米)、小… hk.knowledge.yahoo.com|基于 1 个网页 3. 地里臭氧 而“地里臭氧”(ground-level ozone)是尽人皆知的,它源于车辆尾气、产业废气并经阳光照耀收生的污染物,再渐渐凝集成灰玄...
A6 Ozone is considered a pollutant at ground level but is important in the stratosphere.(a) Explain why the ozone layer is important to us..[1] (b) Explain why ozone is considered as a pollutant at ground level.[1] 相关知识点:
Using data from the Multi-City Multi-CountryCollaborative Research Network, they derived daily average ozone levels (above a maximum background level of 70 micrograms (μg)/m3), particulate matter, temperature, and relative humidity at each location to estimate the daily number of extra deaths att...
Ozone is created at ground level when chemical reactions between volatile organic compounds (VOCs) in sunlight react with oxides of nitrogen (NOx) that are most often human produced. It is not visible, so the haze residents in the Denver metro area and other parts of the ...
It can also be found at ground level.DefinitionOzone (O 3 ) is a tri-atomic form of oxygen that constitutes a minor and variable constituent of the atmosphere. Most of the ozone is found in the stratosphere (which is the region from approximately 15 to 45 km altitude). It can also be...
Long-term trends in ground level ozone over the contiguous United States, 1980–1995 Long-term trends of median and 90th percentile summer afternoon O 3 concentrations were examined at 549 sites across the United States for the 1980–1995 ... AM Fiore,DJ Jacob,JA Logan,... - 《Journal ...
At present, China has made some achievements in the control of PM, NOx and other pollutants; however, the problem of O3pollution has become increasingly prominent. Against the background of China’s severe composite air pollution, the need for the coordinated control of multiple pollutants is bec...