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【多选题】
放射性的食品污染物有( )A.
天然的放射性污染物
B.
核爆；
C.
核废料的排放；
D.
核泄漏。
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【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.
D.
Modern.
【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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