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题目内容:
这篇文章主要介绍的是( )。 A.可视图文信息系统
B.数据通信
C.办公自动化和家庭自动化
D.购物和预约订货
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根据下列文章,请回答题。Too Late to Regret ItWhen I was a junior, I met

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In the experiment, one end of the string was attached to

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阅读短文,完成题 。  金属历来都是通过采矿、冶金制取的,可是80年代初期,科学家发现在聚乙炔中加入强氧化剂或还原剂后,

阅读短文,完成题 。  金属历来都是通过采矿、冶金制取的,可是80年代初期,科学家发现在聚乙炔中加入强氧化剂或还原剂后,它的导电性能大大提高。因为这种塑料具有金

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