单词：chemical refining process
单词：chemical refining process 相关文章
An important new industry, oil refining, grew after the Civil war. Crude oil, or petroleum - a dark, thick ooze from the earth - had been known for hundreds of years, but little use had ever been made
新东方背诵文选
The drug Taxol is a powerful weapon in the fight against cancer, but it's very expensive and complicated to manufacture. Now, scientists at Tufts University and the Massachusetts Institute of Technology (MIT) say they've taken the first steps to make
VOA标准英语2010年(十)月
美国准备销毁叙利亚化学武器 The U.S. Defense Department is preparing to test a system it plans to use to destroy Syria's chemical weapons stockpiles at sea. Officials are offering reassurances that the process will be safe. 美国国防部正
VOA双语新闻 2013年12月
JEFFREY BROWN:And now to part two of our investigative look at the safety of America's drinking water. Science correspondent Miles O'Brien reports on the toxic chemical made famous in the movie Erin Brockovich, its potentially harmful effect on human
PBS访谈环境系列
JUDY WOODRUFF: A few drips of good news greeted residents of West Virginia today, but the fallout from last weeks chemical spill is far from over. There's finally relief for some of the 300,000 West Virginians who've been unable to drink, cook or eve
PBS访谈健康系列
When we remember something, the neurons in our brains communicate with each other in a particular way. The chemical and sometimes even structural changes that occur create a pathway called a memory trace. Signals traveling along these traces are what
英语时差8，16