单词：time-of-flight mass spectrometer
单词：time-of-flight mass spectrometer 相关文章
This is Scientific American's 60-Second Science. I'm John Matson. Got a minute? In a laboratory vault outside Paris is a small cylinder of platinumiridium alloy that serves as the standard for all mass measurements worldwide. By an 1889 international
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City planners and citizens alike frequently push for better public transportation. They argue that it can lessen traffic and reduce emissions from cars. Now theres a new reason to be gung-ho about public transitit helps make people skinnier. Thats ac
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今天我们要学的词是launch。 Launch, 有发起，创办的意思。巴基斯坦反对党领袖布托宣布，如果穆沙拉夫总统拒绝结束国家紧急状态，她就要在星期五发动大规模集会示威， Benazir Bhutto announced
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Americans were exposed to the terror of mass gun violence again on Wednesday, this time at a social services center in San Bernardino, California. The initial reports revealed a distressingly familiar pattern: A heavily armed active shooter or shoote
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今天我们要学的词是launch。 Launch, 有发起，创办的意思。巴基斯坦反对党领袖布托宣布，如果穆沙拉夫总统拒绝结束国家紧急状态，她就要在星期五发动大规模集会示威， Benazir Bhutto announced
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