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There has long been a superstition among mariners that porpoises will save drowning men by pushing them to the surface, or protect them from sharks by 阅读全文
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In the early days of the settlement of Australia, enterprising settlers unwisely introduced the European rabbit. This rabbit had no natural enemies in 阅读全文
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机考 收集信息 分类汇总 会计凭证 报表 财务会计 核算 确认 计量 记录 报告 监督 分类汇总信息 阅读全文
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In the organization of industrial life the influence of the factory upon the physiological and mental state of the workers has been completely neglect 阅读全文
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单调性 求 作变换:x=t/√2 化为正态分布的分布函数,再利用正态分布函数表求值:原式=1/√∫[0,√2]e^(-t^2/2)dt= √π*1/√(2π)∫[0,√2]e^(-t^2/2)dt=√π*[Φ(√2)-Φ(0)]=√3.14159[0.9213-0.5]= 0.7467 阅读全文
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自然科学 俄国 另一个 欧洲 马恩关系 马克思 学术化 阅读全文
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