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【简答题】
当把单缝衍射装置放在水中时，衍射图样发生的变化是（）。用公式 来测定光的波长，测出光的波长是光在（）的波长。
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【简答题】四.阅读理解（30分） A United Nations Climate Change Conference The U.N. Climate Change conference opened in Copenhagen, Denmark on Dec.7th with some 15,000 delegates and observers from nearly 200 countries at...
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【简答题】. COPENHAGEN—The world is gathered in Copenhagen for the U.N. climate summit, but Denmark’s bicycle-friendly capital has also given its name to a movement of cities trying to find a kinder way to comm...
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【简答题】简述数字电路的特点
【简答题】A U.S. scientific report concluded that some trends of climate change were caused by ______.
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