单词：Hach colorimetric zinc analyzer
单词：Hach colorimetric zinc analyzer 相关文章
By Peter Heinlein United Nations 14 February 2006 The U.N. Security Council has issued an appeal for calm in Haiti while results of last week's elections are finalized. A statement unanimously approve
2006年VOA标准英语（二月）
This is the VOA Special English Development Report. Women wait near their children as they are treated for diarrhea at the government-run Children's Hospital in Allahabad, India, earlier this year. Diarrhea kills one and a half million children each
VOA慢速英语2009年（十一）月
SCIENCE IN THE NEWS - From A to Zinc: The Story of Vitamins By Nancy Steinbach Broadcast: Tuesday, March 29, 2005 (MUSIC) VOICE ONE: I'm Bob Doughty with Phoebe Zimmermann, and this is the VOA Special
科技之光
By Robert Berger Jerusalem 12 February 2006 Israel has sharply criticized Russia's decision to open a dialogue with the Islamic militant group Hamas, following its victory in Palestinian parliamentary
2006年VOA标准英语（二月）
Zinc supplements reduce the average cold by about a day and also make symptoms（症状） less severe, according to the latest findings. There's no cure for the common cold, but there's no shortage of ways to treat the symptoms. For a number of year
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