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【简答题】
He has two history lessons every week . ( 划线提问 ) _________ _________ history lessons _________ he ___________ every week ?
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【简答题】以下哪个是系统族
【简答题】阅读理解。 New economy online People are talking about the 'new economy'. It's very different from the 'old economy'. In the old economy, people travel to walk. They buy things in stores. They use the post...
【简答题】People are talking about the “new economy.” It’s very different from the “old economy”. In the old economy, people travel to work. They buy things in stores. They use the post office, the fax and the ...
【简答题】People are talking about the “new economy.” It’s very different from the “old economy”. In the old economy, people travel to walk. They buy things in stores. They use the post office, the fax and the ...
【简答题】由某饱和一元醛和饱和一元酮（通式为C n H 2n O， n≥3，分子中含有羰基，但不能被弱氧化剂氧化）组成的混合物共0.5 mol，其质量为23.4g，此混合物与足量银氨溶液反应，析出86.4g银。推断混合物的可能组成及质量。
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