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如右图，一体积为48 ，母线长为3的圆柱被不平行面的平面所截，截面是一个椭圆，则此椭圆的短轴长为（ ）
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【单选题】( 3 ) Lan guages have been coming and going for thousands of years , but in recent times there has been less coming and a lot more going. When the world was still populated by hunter - gatherers , sma...
A.
B.
C.
D.
D
【单选题】Languages have been coming and going for thousands of years, but in recent times there has been less coming and a lot more going. When the world was still populated by hunter-gatherers, small, tightly...
A.
Complex.
B.
Advanced.
C.
Powerful.
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【简答题】阅读短文，根据其内容简要回答问题。 1. When the Beijing Olympics begin this August, the world will be watching. The s have become a huge international . People will come from around the world to watch 10,500 a...
【简答题】维持蛋白质胶体稳定的因素是_______和_________
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