单词：cesium azide
单词：cesium azide 相关文章
A: What about a medication to help me with my problem? B: There are several types of medications that we can try for your high blood pressure. A: What types of medications would be best? B: For water retention, I am going to start you on Hydrochlorot
英语情景对话-健康
A: Can I get some medicine to help me? B: For your high blood pressure, we have several choices of medications. A: What types of drugs can I try? B: Hydrochlorothiazide is a diuretic that helps with water retention. A: What about side effects from th
英语情景对话-健康
[00:06.37]The United States has a new official clock. [00:10.95]The clock began operating late last year in the American city of Boulder,Colorado. [00:18.39]Experts say the new clock is so exact that it will neither gain nor lose so much as one secon
美国英语听力80篇
Youve given some thought to oxygen, carbon, uranium. But youve probably never mused about the element ytterbium, symbol Yb. A new study by scientists at the National Institute of Standards and Technology, or NIST, says that ytterbium could find a rol
Scientific American(八)月