英文字典中文字典


英文字典中文字典51ZiDian.com



中文字典辞典   英文字典 a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z       







请输入英文单字，中文词皆可：


请选择你想看的字典辞典：
单词字典翻译
Qualifikation查看　Qualifikation　在百度字典中的解释百度英翻中〔查看〕
Qualifikation查看　Qualifikation　在Google字典中的解释Google英翻中〔查看〕
Qualifikation查看　Qualifikation　在Yahoo字典中的解释Yahoo英翻中〔查看〕

安装中文字典英文字典查询工具!


中文字典英文字典工具:
选择颜色:
输入中英文单字

































































英文字典中文字典相关资料:


  • Air pollution - How to convert between mg m3, µg m3 and ppm . . .
    An exception to the conversion process is the air pollutant particulate matter (PM 10 and PM 2 5), as it consists of various tiny solid and liquid particles It is virtually impossible to determine the molecular weights of its complex physical and chemical composition, which is why PM is read in µg m 3 or pcs l (pieces per litre)
  • 1 Environmental Concentration Units - INFLIBNET Centre
    So the dissolved amounts of solids, liquids and gases in water are expressed in mg L-1, which is invariably expressed as ppm For example, 6 7 ppm O2 in water means 6 7 mg O2 to be dissolved in 1 L of water Problem 7 1×10-4 g copper was determined in 1 L of water Calculate the concentration of copper( atomic weight = 63 55) in ppm and in
  • Concentrations of gaseous pollutants is sometimes given in . . .
    times in ppb or ppm ppb (v) is parts per billion by volume (i e , volume of gaseous pollutant per 109 volumes of ambient air) µg m3 is micrograms of gaseous pollutant per cubic meter of ambient air Conversion factors are listed in the table below for a number of substances
  • Indoor Air Unit Conversion Background - US EPA
    This is referred to as “1 part per million” or ppm in aqueous solutions Similarly, 1µg L is referred to as “1 part per billion” or ppb in dilute aqueous solutions because there are 1 billion micrograms in 1 kg However, indoor air units are not expressed as a mass-per-mass ratio, even though they are given as ppm or ppb
  • Unit Conversion Calculator - Eurofins USA - Eurofins Scientific
    Eurofins Environment Testing in Sacramento, CA in partnership with EPA Region 10 and EPA’s Office of Water published Draft Method 1634, an analytical procedure to test for 6PPD-Quinone in surface and stormwater; EPA released the two proposed rules under RCRA; Unveiling EPA 1634: Pioneering 6PPD-Quinone Analysis and its Environmental Implications
  • Understanding Your Test Results - curtiswelldrilling. com
    The two immediately combine to make carbonic acid Note: Acid rain is different; it needs airborne sulfur (air pollution) to create a pH of rain at 4 8 or less As pH drops, the corrosiveness index increases logarithmically I e A pH value of 5 is 10 times more corrosive than water with a pH value of 6 Limestone is the natural buffer to low pH
  • Acute Exposure Guideline Levels for Selected Airborne . . .
    AEGL-2 values derived with a total uncertainty factor of 30 would be 14 ppm for 10 min, 11 ppm for 30 min, 9 0 ppm for 1 h, 6 7 ppm for 4 h, and 5 7 ppm for 8 h, values essentially identical to or below the 10-ppm concentration causing no effects in humans exercising to exhaustion (Bhambhani and Singh 1991; Bhambhani et al 1994, 1996a,b, 1997)





中文字典-英文字典  2005-2009