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A woman was waiting at an airport one night, with several lo
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已知:x^2+xy=3,xy+y^2=-2.求(1)x^2-y^2 (2)x^2+4xy+3y^2 (3)2x^2-xy
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He decided not to tell his parents that he was going home be
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一个句子里可以有多个动词吗?求你们了!我很疑问!解答一下;Father is well enough to go to
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读下列图文资料,回答问题。材料一: 大豆是喜温作物。大豆最适生长温度为日平均气温20
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