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【判断题】
变异系数又称标准离差率,是一个相对指标,表示标准差偏离期望值的程度。
A.
正确
B.
错误
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【简答题】1 ) The floods in the Yangtze Rive r basin are the worst in 44 years.2) Official figures indicate that more than 2000 people have been drowned and 13.8 million have been driven from their jhomes.3) Cr...
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