单词:science of electronical measurement
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SCIENCE IN THE NEWS - Learning First Aid: What to Do Until Medical Help Arrives CHRISTOPHER CRUISE: This is SCIENCE IN THE NEWS in VOA Special English. I'm Christopher Cruise. Today, Bob Doughty and Pat Bodnar provide a short guide to first aid. (MUS
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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